a(n) = binomial(n+2,2)*binomial(n+6,2).

Terms

a(0) =15a(1) =63a(2) =168a(3) =360a(4) =675a(5) =1155a(6) =1848a(7) =2808a(8) =4095a(9) =5775a(10) =7920a(11) =10608a(12) =13923a(13) =17955a(14) =22800a(15) =28560a(16) =35343a(17) =43263a(18) =52440a(19) =63000a(20) =75075a(21) =88803a(22) =104328a(23) =121800a(24) =141375a(25) =163215a(26) =187488a(27) =214368a(28) =244035a(29) =276675