Row 4 of array in A212801.

A006240

Row 4 of array in A212801.

Terms

    a(0) =1a(1) =40a(2) =793a(3) =12800a(4) =193721a(5) =2886520a(6) =42999713a(7) =642355200a(8) =9617422321a(9) =144167168200

External references