What is the next Item in the series

Question

There is a sequence described below.What is the missing item

0,7,26,63,?,...

Answer 1

General formula to find next term is~ $$x^3-1$$ $$1^3-1=0$$ $$2^3-1=7$$ $$3^4-1=26$$ $$4^3-1=63$$ $$5^3-1=124$$ Upcoming number in sequence is 215

Answer 2

The missing item is $42$ of course, and the sequence is:

$$a_n=-\frac{41n^4}{12}+\frac{211n^3}{6}-\frac{1435n^2}{12}+\frac{1025n}{6}-83$$