a(n) = binomial(n+6, 6) * binomial(n+11, n).

Terms

a(0) =1a(1) =84a(2) =2184a(3) =30576a(4) =286650a(5) =2018016a(6) =11435424a(7) =54609984a(8) =226972746a(9) =840639800a(10) =2824549728a(11) =8730426432a(12) =25099975992a(13) =67725379008a(14) =172768824000a(15) =419252346240a(16) =972796459635