a(n) = (n*(n+1))^5.

Terms

a(0) =0a(1) =32a(2) =7776a(3) =248832a(4) =3200000a(5) =24300000a(6) =130691232a(7) =550731776a(8) =1934917632a(9) =5904900000a(10) =16105100000a(11) =40074642432a(12) =92389579776a(13) =199690286432a(14) =408410100000a(15) =796262400000