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How to Construct Pascal's Triangle. In Pascal's Triangle, the top row is 1, with the second row just below it containing 1 and 1. To construct each subsequent row, add each pair of numbers, moving from left to right so that each number on a row is the sum of the two numbers just above it, to the right and the left.Put a 1 on both ends of each row.o construct each subsequent row, add each pair of numbers, moving from left to right so that each number on a row is the sum of the two numbers just above it, to the right and the left. Put a 1 on both ends of each row.
Polygonal Numbers. Connection to Sierpinski Triangle. At the tip of Pascal's Triangle is the number 1, which makes up the 0 th row. The first row (1 & 1) contains two 1's, both formed by adding the two numbers above them to the left and the right, in this case 1 and 0.All numbers outside the triangle are considered 0's.t the tip of Pascal's Triangle is the number 1, which makes up the 0 th row. The first row (1 & 1) contains two 1's, both formed by adding the two numbers above them to the left and the right, in this case 1 and 0. All numbers outside the triangle are considered 0's.