Find the sequence:1,2,6,15,31,56

Hint: This is a progression that requires addition.

Can you solve it now? Post what you did.

If you look at the differences between each pair of numbers in the sequence you should recognize a pattern.

1+1^1, 2+2^2, 6+3^2, 15+4^2, 31+5^2, 56+6^2...