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A001508 Number of simple quadrangulations.
(Formerly M4918 N2111)
1
0, 0, 0, 0, 13, 252, 3740, 51300, 685419, 9095856, 120872850, 1614234960, 21697730849 (list; graph; refs; listen; history; internal format)
OFFSET

1,5

REFERENCES

R. C. Mullin and P. J. Schellenberg, The enumeration of c-nets via triangulations, J. Combin. Theory, 4 (1968), 259-276.

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: A183416 A126422 A106738 * A157946 A034242 A142811

Adjacent sequences:  A001505 A001506 A001507 * A001509 A001510 A001511

KEYWORD

nonn

AUTHOR

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

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Last modified February 15 03:59 EST 2012. Contains 205694 sequences.