a(n) = n^3*(n^7 + 1)/2.

Terms

a(0) =0a(1) =1a(2) =516a(3) =29538a(4) =524320a(5) =4882875a(6) =30233196a(7) =141237796a(8) =536871168a(9) =1743392565a(10) =5000000500a(11) =12968712966a(12) =30958682976a(13) =68929247023a(14) =144627328860a(15) =288325197000a(16) =549755815936