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

Terms

a(0) =0a(1) =24a(2) =576a(3) =4320a(4) =19200a(5) =63000a(6) =169344a(7) =395136a(8) =829440a(9) =1603800a(10) =2904000a(11) =4983264a(12) =8176896a(13) =12918360a(14) =19756800a(15) =29376000a(16) =42614784a(17) =60488856a(18) =84214080a(19) =115231200a(20) =155232000a(21) =206186904a(22) =270374016a(23) =350409600a(24) =449280000a(25) =570375000a(26) =717522624a(27) =895025376a(28) =1107697920