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A006926 Number of trivalent graphs of girth exactly 6 and 2n nodes.
(Formerly M3969)
+0
1
1, 1, 5, 32, 385, 7573, 181224, 4624480, 122089998 (list; graph; listen)
OFFSET

7,3

REFERENCES

N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence).

CRC Handbook of Combinatorial Designs, 1996, p. 647.

Gordon Royle, personal communication.

CROSSREFS

Sequence in context: A093448 A094653 A135250 this_sequence A014374 A125709 A043068

Adjacent sequences: A006923 A006924 A006925 this_sequence A006927 A006928 A006929

KEYWORD

nonn

AUTHOR

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

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Last modified November 25 20:09 EST 2009. Contains 167514 sequences.


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