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A004109 Number of connected trivalent (or cubic) labeled graphs with 2n nodes.
(Formerly M5345)
+0
1
0, 1, 70, 19320, 11166120, 11543439600, 19491385914000, 50233275604512000, 187663723374359232000, 975937986889287117696000, 6838461558851342749449120000, 62856853767402275979616458240000 (list; graph; listen)
OFFSET

1,3

REFERENCES

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

R. C. Read, Some Enumeration Problems in Graph Theory. Ph.D. Dissertation, Department of Mathematics, Univ. London, 1958.

R. W. Robinson, Numerical implementation of graph counting algorithms, AGRC Grant, Math. Dept., Univ. Newcastle, Australia, 1976.

LINKS

R. W. Robinson, Table of n, a(n) for n = 1..29

CROSSREFS

Sequence in context: A007100 A103157 A007099 this_sequence A002829 A145410 A005983

Adjacent sequences: A004106 A004107 A004108 this_sequence A004110 A004111 A004112

KEYWORD

nonn,nice

AUTHOR

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

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Last modified December 20 16:40 EST 2009. Contains 171081 sequences.


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