Let $x_1,\ldots,x_n$ be a sequence with each term equal to $0$ or $1$. Form a triangle as follows: its first row is $x_1,\ldots,x_n$ and if a row if $a_1, a_2, \ldots, a_m$, then the next row is $a_1 + a_2, a_2 + a_3, \ldots, a_{m-1} + a_m$ where the addition is performed modulo $2$ (so $1+1=0$). For example, starting from $1$, $0$, $1$, $0$, the second row is $1$, $1$, $1$, the third one is $0$, $0$ and the fourth one is $0$.

A sequence is called good it is the same as the sequence formed by taking the last element of each row, starting from the last row (so in the above example, the sequence is $1010$ and the corresponding sequence from last terms is $0010$ and they are not equal in this case). How many possibilities are there for the sequence formed by taking the first element of each row, starting from the last row, which arise from a good sequence?  
To solve this problem, we need to understand the structure of the triangle and the properties of the sequence. Let's break down the solution step by step.

1. **Understanding the Triangle Formation:**
   - The first row of the triangle is given by the sequence \( x_1, x_2, \ldots, x_n \).
   - Each subsequent row is formed by adding adjacent elements of the previous row modulo 2. For example, if the first row is \( x_1, x_2, \ldots, x_n \), the second row will be \( x_1 + x_2, x_2 + x_3, \ldots, x_{n-1} + x_n \) (modulo 2).

2. **Defining a Good Sequence:**
   - A sequence is called good if it is the same as the sequence formed by taking the last element of each row, starting from the last row.

3. **Analyzing the Problem:**
   - We need to find the number of possibilities for the sequence formed by taking the first element of each row, starting from the last row, which arise from a good sequence.

4. **Symmetry and Rotational Invariance:**
   - By observing the properties of the triangle, we note that if \( a, b, c \) are in an equilateral triangle of side length 1, with \( c \) below \( a \) and \( b \), then \( c = a + b \) (mod 2). This implies that \( a = b + c \) and \( b = a + c \).
   - Rotating the triangle \( 120^\circ \) clockwise and performing the same operations starting from the entries of the top row does not change the outcome. This symmetry suggests that the sequence must be symmetric with respect to its midpoint.

5. **Symmetric Sequences:**
   - For the sequence to be symmetric, the first half of the sequence must mirror the second half. This means that the sequence can be divided into two parts, and each part determines the other.

6. **Counting the Possibilities:**
   - If \( n \) is even, the sequence can be divided into two equal parts of length \( n/2 \). Each part can be any binary sequence of length \( n/2 \), giving \( 2^{n/2} \) possibilities.
   - If \( n \) is odd, the sequence can be divided into two parts, one of length \( \lceil n/2 \rceil \) and the other of length \( \lfloor n/2 \rfloor \). Since \( \lceil n/2 \rceil = \lfloor n/2 \rfloor + 1 \), the number of possibilities is \( 2^{\lceil n/2 \rceil} \).

Therefore, the number of possibilities for the sequence formed by taking the first element of each row, starting from the last row, which arise from a good sequence, is \( 2^{\lceil n/2 \rceil} \).

The final answer is \( \boxed{ 2^{\lceil n/2 \rceil} } \).