What should be the next number in this series - 1, 2, 6, 30, 68, ??

Question

On behalf of Sture Sjöstedt

Answer 1

0^0+0 = 1
1^1 + 1 = 2
2^2 + 2 = 6
3^3 + 3 = 30
4^(4-1) + 4 = 68
5^(5-1) + 5 = 630

So answer is 630

Answer 2

answer is 138

Answer 3

first tell weather it is correct that the answer is 138