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A292468 Number of 4-regular maps with n vertices on the torus, up to orientation-preserving and orientation-reversing isomorphisms. 3
1, 4, 20, 133, 1013, 9209, 89889, 929373, 9880120, 107087360, 1174950951, 13008800489, 145024885270, 1625819872988, 18311555574347, 207068032188985, 2349706730746994, 26745505016101977, 305267158873891108, 3492857897924201864 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

LINKS

Table of n, a(n) for n=1..20.

E. Krasko, A. Omelchenko, Enumeration of r-regular Maps on the Torus. Part II: Enumeration of Unsensed Maps, arXiv preprint arXiv:1709.03230 [math.CO], 2017. See Table 1, p. 20.

E. Krasko, A. Omelchenko, Enumeration of r-regular maps on the torus. Part II: Unsensed maps, Discrete Mathematics, Volume 342, Issue 2, February 2019, pp. 600-614.

CROSSREFS

Cf. A292408 (enumerates up to orientation-preserving isomorphisms only).

Sequence in context: A172110 A251179 A201355 * A143463 A290444 A270665

Adjacent sequences:  A292465 A292466 A292467 * A292469 A292470 A292471

KEYWORD

nonn

AUTHOR

Evgeniy Krasko, Sep 17 2017

STATUS

approved

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Last modified October 16 13:16 EDT 2019. Contains 328074 sequences. (Running on oeis4.)