a(n) = C(n+3,3) * C(n+5,5).

Terms

a(0) =1a(1) =24a(2) =210a(3) =1120a(4) =4410a(5) =14112a(6) =38808a(7) =95040a(8) =212355a(9) =440440a(10) =858858a(11) =1589952a(12) =2815540a(13) =4798080a(14) =7907040a(15) =12651264a(16) =19718181a(17) =30020760a(18) =44753170a(19) =65456160a(20) =94093230a(21) =133138720a(22) =185679000a(23) =255528000a(24) =347358375a(25) =466849656a(26) =620854794a(27) =817586560a(28) =1066825320