What is the 100th term of this sequence?

1, 2, 7, 16, 29....

I can't figure this out.

1, 2, 7, 16, 29........etc.

The "closed form" of your sequence appears to be:

a_n = 2 n^2 - 5 n + 4 . Hence the 100th term is:

a(100) =2*100^2 - 5*100 + 4

a(100) =19,504