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A225681 Number of binary words of length n that are not rich. 1
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 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,9

LINKS

Table of n, a(n) for n=0..25.

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

FORMULA

2^n - A216264(n).

CROSSREFS

Cf. A216264.

Sequence in context: A026977 A026952 A222670 * A259814 A009769 A119878

Adjacent sequences:  A225678 A225679 A225680 * A225682 A225683 A225684

KEYWORD

nonn,more

AUTHOR

N. J. A. Sloane, May 16 2013

STATUS

approved

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Last modified June 18 17:05 EDT 2019. Contains 324214 sequences. (Running on oeis4.)