A094578 A094559/4.

0, 0, 1, 4, 19, 76, 316, 1264, 5101, 20404, 81796, 327184, 1309444, 5237776, 20953936, 83815744, 335274259, 1341097036, 5364433276, 21457733104, 85831112764, 343324451056, 1373298525616, 5493194102464, 21972779294716

Offset: 0

Author

N. J. A. Sloane, Jun 06 2004

Keywords

• nonn
• easy

Extensions

More terms from Brian Kuehn (brk158(AT)psu.edu), Apr 20 2006