Main diagonal of arrays A063180 and A063181.

A063399

Main diagonal of arrays A063180 and A063181.

Terms

    a(0) =1a(1) =1a(2) =7a(3) =115a(4) =3205a(5) =138345a(6) =8543519a(7) =714313647a(8) =77657039081

External references