A225681 Number of binary words of length n that are not rich.

0, 0, 0, 0, 0, 0, 0, 0, 4, 24, 92, 292, 850, 2276, 5766, 13968, 32690, 74368, 165442, 361104, 776116, 1646566, 3456030, 7189232, 14844878, 30464914

Offset: 0

Author

N. J. A. Sloane, May 16 2013

Keywords

• nonn
• more

Links

• Amy Glen, Jacques Justin, Steve Widmer and Luca Q. Zamboni, Palindromic richness, arXiv:0801.1656 [math.CO]

Crossrefs

Cf. A216264.

Formula

2^n - A216264(n).