a(n) = n^3*(n^4 + n^2 - 1).

Terms

a(0) =1a(1) =152a(2) =2403a(3) =17344a(4) =81125a(5) =287496a(6) =840007a(7) =2129408a(8) =4841289a(9) =10099000a(10) =19646891a(11) =36078912a(12) =63117613a(13) =105948584a(14) =171615375a(15) =269479936a(16) =411753617a(17) =614103768a(18) =896340979a(19) =1283192000a(20) =1805163381a(21) =2499500872a(22) =3411249623a(23) =4594420224a(24) =6113265625a(25) =8043673976