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Search: id:A006924
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| A006924 |
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Number of trivalent graphs of girth exactly 4 and 2n nodes.
(Formerly M1526)
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+0
1
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| 0, 1, 2, 5, 20, 101, 743, 7350, 91763, 1344782, 22160335, 401278984
(list; graph; listen)
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OFFSET
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2,3
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REFERENCES
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CRC Handbook of Combinatorial Designs, 1996, p. 647.
Gordon Royle, personal communication.
N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence).
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CROSSREFS
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Sequence in context: A020001 A039909 A009551 this_sequence A152562 A006867 A019536
Adjacent sequences: A006921 A006922 A006923 this_sequence A006925 A006926 A006927
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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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