The following isosceles trapezoid consists of equal equilateral triangles with side length $1$.  The side $A_1E$ has length $3$ while the larger base $A_1A_n$ has length $n-1$.  Starting from the point $A_1$ we move along the segments which are oriented to the right and up(obliquely right or left). Calculate (in terms of $n$ or not) the number of all possible paths we can follow, in order to arrive at points $B,\Gamma,\Delta, E$, if $n$ is an integer greater than $3$.

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1. **Define the structure of the isosceles trapezoid:**
   - The trapezoid consists of equal equilateral triangles with side length 1.
   - The side \( A_1E \) has length 3.
   - The larger base \( A_1A_n \) has length \( n-1 \).

2. **Identify the layers:**
   - The trapezoid can be divided into layers, where each layer is a horizontal section between two lines.
   - The bottom layer has \( 2n-2 \) oblique segments.
   - The middle layer has \( 2n-4 \) oblique segments.
   - The top layer has \( 2n-6 \) oblique segments.

3. **Calculate the number of paths to point \( E \):**
   - To go from \( A_1 \) to \( E \), we need to choose one oblique segment from each layer.
   - The number of ways to choose these segments is:
     \[
     (2n-2)(2n-4)(2n-6)
     \]
   - Simplify the expression:
     \[
     (2n-2)(2n-4)(2n-6) = 8n^3 - 48n^2 + 88n - 48
     \]

4. **Calculate the number of paths to point \( \Delta \):**
   - The number of paths to \( \Delta \) is the same as to \( E \):
     \[
     8n^3 - 48n^2 + 88n - 48
     \]

5. **Calculate the number of paths to point \( \Gamma \):**
   - To go from \( A_1 \) to \( \Gamma \), we only need to choose oblique segments from the bottom and middle layers.
   - The number of ways to choose these segments is:
     \[
     (2n-2)(2n-4)
     \]
   - Simplify the expression:
     \[
     (2n-2)(2n-4) = 4n^2 - 12n + 8
     \]

6. **Calculate the number of paths to point \( B \):**
   - To go from \( A_1 \) to \( B \), we only need to choose oblique segments from the bottom layer.
   - The number of ways to choose these segments is:
     \[
     2n-2
     \]

7. **Sum the total number of paths:**
   - The total number of paths is the sum of the paths to \( E \), \( \Delta \), \( \Gamma \), and \( B \):
     \[
     2(8n^3 - 48n^2 + 88n - 48) + (4n^2 - 12n + 8) + (2n - 2)
     \]
   - Simplify the expression:
     \[
     2(8n^3 - 48n^2 + 88n - 48) + 4n^2 - 12n + 8 + 2n - 2 = 16n^3 - 96n^2 + 176n - 96 + 4n^2 - 12n + 8 + 2n - 2
     \]
     \[
     = 16n^3 - 92n^2 + 166n - 90
     \]

The final answer is \(\boxed{16n^3 - 92n^2 + 166n - 90}\)