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A003175 Number of trivalent graphs with 2n nodes.
(Formerly M1847) 		0
1, 2, 8, 31, 139, 724 (list; graph; refs; listen; history; internal format)
OFFSET

0,2

COMMENTS

This definition is incomplete. I have the full definition in my files (somewhere). A005638 is the main entry for this sequence.

REFERENCES

P. A. Morris, personal communication.

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

CROSSREFS

Cf. A005638.

Sequence in context: A150818 A009567 A150819 * A129427 A150820 A150821

Adjacent sequences:  A003172 A003173 A003174 * A003176 A003177 A003178

KEYWORD

nonn

AUTHOR

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

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Last modified February 14 23:53 EST 2012. Contains 205689 sequences.