a(n) = (n^2+n^3)*binomial(2*n,n).

Terms

a(0) =0a(1) =4a(2) =72a(3) =720a(4) =5600a(5) =37800a(6) =232848a(7) =1345344a(8) =7413120a(9) =39382200a(10) =203231600a(11) =1024287264a(12) =5062180032a(13) =24607819600a(14) =117942804000a(15) =558423072000