a(n) = n^2*(16*n^4-20*n^2+7)/3.

Terms

a(0) =1a(1) =244a(2) =3369a(3) =20176a(4) =79225a(5) =240276a(6) =611569a(7) =1370944a(8) =2790801a(9) =5266900a(10) =9351001a(11) =15787344a(12) =25552969a(13) =39901876a(14) =60413025a(15) =89042176a(16) =128177569a(17) =180699444a(18) =250043401a(19) =340267600a(20) =456123801a(21) =603132244a(22) =787660369a(23) =1017005376a(24) =1299480625a(25) =1644505876a(26) =2062701369a(27) =2565985744a(28) =3167677801a(29) =3882602100