0,3,8,15,24 determine the nth for the number pattern

Answer 1

0 = 1^2 - 1
3 = 2^2 - 1
8 = 3^2 - 1
15= 4^2 - 1
25= 5^2 - 1

Term = n^2 - 1

Answer 2

when you take out the 0 and be left with 3 and the rest what will be the formular