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

Terms

a(0) =0a(1) =960a(2) =10800a(3) =60480a(4) =235200a(5) =725760a(6) =1905120a(7) =4435200a(8) =9408960a(9) =18532800a(10) =34354320a(11) =60540480a(12) =102211200a(13) =166333440a(14) =262180800a(15) =401863680a(16) =600935040a(17) =879076800a(18) =1260871920a(19) =1776667200a(20) =2463531840a(21) =3366316800a(22) =4538820000