The second diagonal in it lists the natural numbers in order and the third diagonal lists the triangular numbers.
The second diagonal in it lists the natural numbers in order and the third diagonal lists the triangular numbers. However, the rows are usually considered to be more important: the nth row lists all n+1 binomial coefficients for an nth power binomial expansion. More commonly, it is stated that each number is the sum of the two numbers above it in, for 10 points, what triangle of numbers named for a French mathematician?
The second diagonal in it lists the natural numbers in order and the third diagonal lists the triangular numbers.
{Pascal}'s triangle