a(n) = C(1+n,1) * C(2+n,1) * C(4+n,2).

Terms

a(0) =12a(1) =60a(2) =180a(3) =420a(4) =840a(5) =1512a(6) =2520a(7) =3960a(8) =5940a(9) =8580a(10) =12012a(11) =16380a(12) =21840a(13) =28560a(14) =36720a(15) =46512a(16) =58140a(17) =71820a(18) =87780a(19) =106260a(20) =127512a(21) =151800a(22) =179400a(23) =210600a(24) =245700a(25) =285012a(26) =328860a(27) =377580a(28) =431520a(29) =491040