a(n) = binomial(n+5,n)*binomial(n+9,n).

Terms

a(0) =1a(1) =60a(2) =1155a(3) =12320a(4) =90090a(5) =504504a(6) =2312310a(7) =9060480a(8) =31286970a(9) =97337240a(10) =277411134a(11) =733649280a(12) =1818838840a(13) =4261894560a(14) =9502285320a(15) =20271542016a(16) =41572498275a(17) =82281899700a(18) =157706974425a(19) =293570877600a(20) =532097215650a(21) =941124327000