a(n) = n^4*(n^4+1)*(n^2-1).

Terms

a(0) =0a(1) =0a(2) =816a(3) =53136a(4) =986880a(5) =9390000a(6) =58831920a(7) =276825696a(8) =1057222656a(9) =3444262560a(10) =9900990000a(11) =25724822640a(12) =61490347776a(13) =137047559376a(14) =287786357040a(15) =574098840000