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A268572 Arises in counting maps on a surface: see Coquereaux-Zuber (2015) for precise definition. 0
0, 0, 2, 1, 4, 9, 38, 133, 640, 2864 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,3

LINKS

Table of n, a(n) for n=1..10.

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: A254199 A343398 A097949 * A343909 A117338 A279927

Adjacent sequences:  A268569 A268570 A268571 * A268573 A268574 A268575

KEYWORD

nonn,more

AUTHOR

N. J. A. Sloane, Mar 03 2016

STATUS

approved

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Last modified May 17 22:15 EDT 2021. Contains 343992 sequences. (Running on oeis4.)