a(n) = n^9*(n^2 + 1)/2.

Terms

a(0) =0a(1) =1a(2) =1280a(3) =98415a(4) =2228224a(5) =25390625a(6) =186437376a(7) =1008840175a(8) =4362076160a(9) =15884240049a(10) =50500000000a(11) =143834809151a(12) =374084075520a(13) =901382446705