A181571 Third column of triangle in A179898.

1, 6, 40, 300, 2475, 22022, 208208, 2068560, 21414900, 229523800, 2533942752, 28698821320, 332357673375, 3925129083750, 47167131780000, 575637606165600, 7123515376299300, 89266155250239000, 1131410294476020000, 14489559984061890000, 187330691180608155180, 2443121585638964379864

Offset: 1

Author

N. J. A. Sloane, Jan 30 2011

Keywords

• nonn

Crossrefs

Cf. A179898, A005700, A005701.