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A268558
Arises in counting maps on a surface: see Coquereaux-Zuber (2015) for precise definition.
1
2, 8, 34, 182, 1300, 12634, 153598, 2231004, 37250236, 699699968, 14574247086, 333121322514, 8286605836248, 222824153996898, 6439779836400464, 199051769194393718, 6552226226766384216, 228826838199807593530
OFFSET
1,1
LINKS
R. de Mello Koch, S. Ramgoolam, Strings from Feynman graph counting: Without large N, Phys. Rev. D 85 (2012) 026007. Different from a(7) onwards.
R. Coquereaux, J.-B. Zuber, Maps, immersions and permutations, arXiv preprint arXiv:1507.03163, 2015. Also J. Knot Theory Ramifications 25, 1650047 (2016),
CROSSREFS
Euler transform of A170946.
Sequence in context: A121894 A061370 A126328 * A191569 A229812 A346413
KEYWORD
nonn
AUTHOR
N. J. A. Sloane, Mar 02 2016
EXTENSIONS
a(11) and beyond from Euler transform of A170946 - R. J. Mathar, Apr 07 2022
STATUS
approved