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Search: id:A006923
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| A006923 |
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Number of trivalent graphs of girth exactly 3 and 2n nodes.
(Formerly M2944)
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+0
1
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| 1, 1, 3, 13, 63, 399, 3268, 33496, 412943, 5883727, 94159721, 1661723296
(list; graph; listen)
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OFFSET
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2,3
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REFERENCES
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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.
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CROSSREFS
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Sequence in context: A000259 A007855 A107097 this_sequence A011272 A065065 A020086
Adjacent sequences: A006920 A006921 A006922 this_sequence A006924 A006925 A006926
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KEYWORD
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nonn
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AUTHOR
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N. J. A. Sloane (njas(AT)research.att.com).
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