A002006 Almost trivalent maps. (Formerly M2137 N0849)

2, 24, 272, 3424, 46720, 676608, 10251520, 160900608

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..7.

H. Bottomley, Illustration of initial terms

Colin Defant and Kai Zheng, Stack-Sorting with Consecutive-Pattern-Avoiding Stacks, arXiv:2008.12297 [math.CO], 2020.

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

Crossrefs

Cf. A002007, A002008, A002009, A002010.

Sequence in context: A061190 A300399 A221082 * A230129 A355951 A065101

Adjacent sequences: A002003 A002004 A002005 * A002007 A002008 A002009

Keyword

nonn,more

Author

N. J. A. Sloane

Status

approved