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A268564 Arises in counting maps on a surface: see Coquereaux-Zuber (2015) for precise definition. 0
1, 16, 555, 27155, 1624602 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

LINKS

Table of n, a(n) for n=1..5.

R. Coquereaux, J.-B. Zuber, Maps, immersions and permutations, arXiv preprint arXiv:1507.03163, 2015. Also J. Knot Theory Ramifications 25, 1650047 (2016), DOI: http://dx.doi.org/10.1142/S0218216516500474

CROSSREFS

Sequence in context: A196683 A131515 A223106 * A268566 A189147 A063082

Adjacent sequences:  A268561 A268562 A268563 * A268565 A268566 A268567

KEYWORD

nonn,more

AUTHOR

N. J. A. Sloane, Mar 02 2016

STATUS

approved

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Last modified August 13 22:39 EDT 2022. Contains 356109 sequences. (Running on oeis4.)