a(n) = n^3*(n^8 + 1)/2.

Terms

a(0) =0a(1) =1a(2) =1028a(3) =88587a(4) =2097184a(5) =24414125a(6) =181398636a(7) =988663543a(8) =4294967552a(9) =15690530169a(10) =50000000500a(11) =142655835971a(12) =371504186208a(13) =896080198117