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A002005 Almost trivalent maps.
(Formerly M3646 N1483)
0
1, 4, 32, 336, 4096, 54912, 786432, 11824384 (list; graph; refs; listen; history; internal format)
OFFSET

0,2

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).

CROSSREFS

Sequence in context: A090004 A061631 A099912 * A123309 A186391 A137432

Adjacent sequences:  A002002 A002003 A002004 * A002006 A002007 A002008

KEYWORD

nonn

AUTHOR

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

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Last modified February 16 17:48 EST 2012. Contains 205939 sequences.