The nth term that is killing me
So basically I've got this set of numbers and I've found the pattern but i can't figure out how to into a formula. It's kinda important because it's part of my coursework, which really needs to be posted in the next few days.
So here be the numbers
1st set of differences:
2end set of differences:
3erd set of differences:
I think it's something to do with n^3 but I really can't figure it out.