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A351363
Number of necklaces with n black and n white beads with at least four consecutive black beads.
1
0, 0, 0, 1, 5, 21, 84, 327, 1251, 4760, 18018, 68104, 257088, 970480, 3664070, 13842215, 52331695, 198021936, 750027090, 2843686271, 10792866315, 41006110365, 155961264880, 593797895358, 2263126224780, 8634161689920, 32973466762098, 126047166461574, 482298648250416, 1847156083546316
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OFFSET
1,5
LINKS
Table of n, a(n) for n=1..30.
Marko R. Riedel et al., Necklaces made of black and white beads, Math StackExchange, Feb 2022.
FORMULA
a(n) = A003239(n) - A351364(n).
CROSSREFS
Cf. A351359, A351357, A351358, A351359, A351360, A351361.
Sequence in context: A083319 A146041 A146585 * A215008 A026027 A002054
Adjacent sequences: A351360 A351361 A351362 * A351364 A351365 A351366
KEYWORD
nonn
AUTHOR
Marko Riedel, Feb 08 2022
STATUS
approved

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Last modified May 19 07:15 EDT 2026. Contains 395699 sequences.
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