a(n) = binomial(n+6,6) * binomial(n+10,6).

Terms

a(0) =210a(1) =3234a(2) =25872a(3) =144144a(4) =630630a(5) =2312310a(6) =7399392a(7) =21237216a(8) =55747692a(9) =135795660a(10) =310390080a(11) =671571264a(12) =1385115732a(13) =2738894004a(14) =5216940960a(15) =9610154400a(16) =17178150990a(17) =29881321470a(18) =50707697040a(19) =84126042000a(20) =136704818250a(21) =217946538810a(22) =341398774080a(23) =526116951360