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A002006 Almost trivalent maps.
(Formerly M2137 N0849)
0
2, 24, 272, 3424, 46720, 676608, 10251520, 160900608 (list; graph; refs; listen; history; 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

H. Bottomley, Illustration of initial terms

CROSSREFS

Sequence in context: A187584 A173228 A061190 * A065101 A052739 A135389

Adjacent sequences:  A002003 A002004 A002005 * A002007 A002008 A002009

KEYWORD

nonn

AUTHOR

N. J. A. Sloane (njas(AT)research.att.com).

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Last modified February 15 15:20 EST 2012. Contains 205823 sequences.