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A001507 Number of simple quadrangulations.
(Formerly M3132 N1270)
1
0, 0, 0, 3, 33, 338, 3580, 39525, 452865, 5354832, 65022840, 807560625, 10224817515, 131631305614 (list; graph; refs; listen; history; internal format)
OFFSET

1,4

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: A097486 A121515 A002277 * A075835 A077698 A080488

Adjacent sequences:  A001504 A001505 A001506 * A001508 A001509 A001510

KEYWORD

nonn

AUTHOR

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

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Last modified February 14 09:50 EST 2012. Contains 205614 sequences.