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

Terms

a(0) =0a(1) =1a(2) =160a(3) =3645a(4) =34816a(5) =203125a(6) =863136a(7) =2941225a(8) =8519680a(9) =21789081a(10) =50500000a(11) =108065221a(12) =216483840a(13) =410278765a(14) =741659296a(15) =1287140625a(16) =2155872256a(17) =3499947505a(18) =5526986400a(19) =8515304461a(20) =12832000000a(21) =18954312741a(22) =27494626720a(23) =39229510585a(24) =55133208576