a(n) = n^2*(n^6+1)/2.

Terms

a(0) =0a(1) =1a(2) =130a(3) =3285a(4) =32776a(5) =195325a(6) =839826a(7) =2882425a(8) =8388640a(9) =21523401a(10) =50000050a(11) =107179501a(12) =214990920a(13) =407865445a(14) =737894626a(15) =1281445425a(16) =2147483776a(17) =3487878865a(18) =5509980450a(19) =8491781701a(20) =12800000200a(21) =18911429901a(22) =27437937010a(23) =39155492905a(24) =55037657376