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A002007 Almost trivalent maps.
(Formerly M4987 N2144)
4
15, 200, 2672, 37600, 554880, 8514560, 134864640 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,1

REFERENCES

R. C. Mullin, E. Nemeth and P. J. Schellenberg, The enumeration of almost cubic maps, pp. 281-295 in Proceedings of the Louisiana Conference on Combinatorics, Graph Theory and Computer Science. Vol. 1, edited R. C. Mullin et al., 1970.

N. J. A. Sloane, A Handbook of Integer Sequences, Academic Press, 1973 (includes this sequence).

N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence).

LINKS

Table of n, a(n) for n=0..6.

Jian Zhou, Fat and Thin Emergent Geometries of Hermitian One-Matrix Models, arXiv:1810.03883 [math-ph], 2018.

CROSSREFS

Cf. A002006, A002008, A002009, A002010.

Sequence in context: A322914 A014896 A048444 * A207835 A178507 A012566

Adjacent sequences:  A002004 A002005 A002006 * A002008 A002009 A002010

KEYWORD

nonn,more

AUTHOR

N. J. A. Sloane.

STATUS

approved

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Last modified May 28 17:37 EDT 2020. Contains 334684 sequences. (Running on oeis4.)