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

Terms

a(0) =0a(1) =16a(2) =360a(3) =1920a(4) =6160a(5) =15120a(6) =31416a(7) =58240a(8) =99360a(9) =159120a(10) =242440a(11) =354816a(12) =502320a(13) =691600a(14) =929880a(15) =1224960a(16) =1585216a(17) =2019600a(18) =2537640a(19) =3149440a(20) =3865680a(21) =4697616a(22) =5657080a(23) =6756480a(24) =8008800a(25) =9427600a(26) =11027016a(27) =12821760a(28) =14827120a(29) =17058960