Fourth column of triangle A055864.

A055867

Fourth column of triangle A055864.

Terms

    a(0) =0a(1) =0a(2) =0a(3) =64a(4) =750a(5) =10584a(6) =175616a(7) =3359232a(8) =72900000a(9) =1771561000a(10) =47692136448

External references