a(n) = n!*LaguerreL(n, n).

Terms

a(0) =1a(1) =0a(2) =-2a(3) =6a(4) =24a(5) =-380a(6) =720a(7) =31794a(8) =-361088a(9) =-2104056a(10) =101548800a(11) =-612792290a(12) =-25534891008a(13) =593660731404