a(n) = n * (n+1)^2 * (n+2)^3 * (n+3)^4.

Terms

a(0) =0a(1) =27648a(2) =720000a(3) =7776000a(4) =51861600a(5) =252887040a(6) =987614208a(7) =3265920000a(8) =9487368000a(9) =24839654400a(10) =59717623680a(11) =133689523968a(12) =281719620000a(13) =563576832000