a(0) = 1, a(1) = 0, a(n) = 2*n*(a(n-1) + a(n-2)), n > 1.

A179539

a(0) = 1, a(1) = 0, a(n) = 2*n*(a(n-1) + a(n-2)), n > 1.

Terms

    a(0) =1a(1) =0a(2) =4a(3) =24a(4) =224a(5) =2480a(6) =32448a(7) =488992a(8) =8343040a(9) =158976576a(10) =3346392320a(11) =77118115712

External references