a(n) = (11*n+5)*(n+4)*(n+3)*(n+2)*(n+1)/120.

Terms

a(0) =1a(1) =16a(2) =81a(3) =266a(4) =686a(5) =1512a(6) =2982a(7) =5412a(8) =9207a(9) =14872a(10) =23023a(11) =34398a(12) =49868a(13) =70448a(14) =97308a(15) =131784a(16) =175389a(17) =229824a(18) =296989a(19) =378994a(20) =478170a(21) =597080a(22) =738530a(23) =905580a(24) =1101555a(25) =1330056a(26) =1594971a(27) =1900486a(28) =2251096a(29) =2651616