The main diagonal in the difference table of A240559.

A240561

The main diagonal in the difference table of A240559.

Terms

    a(0) =0a(1) =1a(2) =-10a(3) =178a(4) =-5296a(5) =238816a(6) =-15214480a(7) =1301989648a(8) =-144118832896

External references