a(n) = (5*n^9 - 30*n^7 + 63*n^5 - 50*n^3 + 12*n)/360.

Terms

a(0) =0a(1) =0a(2) =1a(3) =130a(4) =2446a(5) =21146a(6) =117971a(7) =494732a(8) =1695036a(9) =4992492a(10) =13072917a(11) =31153342a(12) =68720938a(13) =142120342a(14) =278268263a(15) =519829688a(16) =932250488a(17) =1613106744a(18) =2704301673a(19) =4407716634a(20) =7005003334a(21) =10882290034a(22) =16560665275a(23) =24733398404a(24) =36310956980a(25) =52474986980a(26) =74742532605a(27) =105041888406a(28) =145801597410a(29) =200054234926