a(n) = n^3*(n^3 + 1)*(n-1).

Terms

a(0) =0a(1) =0a(2) =72a(3) =1512a(4) =12480a(5) =63000a(6) =234360a(7) =707952a(8) =1838592a(9) =4257360a(10) =9009000a(11) =17728920a(12) =32864832a(13) =57948072a(14) =97919640a(15) =159516000a(16) =251719680a(17) =386279712a(18) =578306952a(19) =846949320a(20) =1216152000a(21) =1715507640