a(n) = binomial(n+2, 2)*binomial(n+7, n).

Terms

a(0) =1a(1) =24a(2) =216a(3) =1200a(4) =4950a(5) =16632a(6) =48048a(7) =123552a(8) =289575a(9) =629200a(10) =1283568a(11) =2482272a(12) =4585308a(13) =8139600a(14) =13953600a(15) =23193984a(16) =37509021a(17) =59183784a(18) =91333000a(19) =138138000a(20) =205134930a(21) =299562120a(22) =430775280a(23) =610740000a(24) =854611875a(25) =1181415456a(26) =1614834144a(27) =2184124096a(28) =2925166200