a(n) = C(n+4,4) * C(n+6,6).

Terms

a(0) =1a(1) =35a(2) =420a(3) =2940a(4) =14700a(5) =58212a(6) =194040a(7) =566280a(8) =1486485a(9) =3578575a(10) =8016008a(11) =16893240a(12) =33786480a(13) =64574160a(14) =118605600a(15) =210327264a(16) =361499985a(17) =604167795a(18) =984569740a(19) =1568220500a(20) =2446423980a(21) =3744526500a(22) =5632263000a(23) =8336601000a(24) =12157543125a(25) =17487410031a(26) =24834191760