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

Terms

a(0) =0a(1) =1a(2) =768a(3) =39366a(4) =655360a(5) =5859375a(6) =35271936a(7) =161414428a(8) =603979776a(9) =1937102445a(10) =5500000000a(11) =14147686146a(12) =33538572288a(13) =74231495611a(14) =154957850880a(15) =307546875000a(16) =584115552256