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

Terms

a(0) =21a(1) =84a(2) =216a(3) =450a(4) =825a(5) =1386a(6) =2184a(7) =3276a(8) =4725a(9) =6600a(10) =8976a(11) =11934a(12) =15561a(13) =19950a(14) =25200a(15) =31416a(16) =38709a(17) =47196a(18) =57000a(19) =68250a(20) =81081a(21) =95634a(22) =112056a(23) =130500a(24) =151125a(25) =174096a(26) =199584a(27) =227766a(28) =258825a(29) =292950