What are the list for triangular numbers?

Triangular numbers are a sequence of numbers that can form an equilateral triangle. They are generated by the formula ( T_n = \frac{n(n + 1)}{2} ), where ( n ) is a positive integer. The first few triangular numbers are 1, 3, 6, 10, 15, 21, and 28. Each number represents the total number of dots that can form a triangle with ( n ) layers.