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A006786
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Squarefree graphs on n vertices.
(Formerly M1149)
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2
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1, 2, 4, 8, 18, 44, 117, 351, 1230, 5069, 25181, 152045, 1116403, 9899865, 104980369, 1318017549, 19427531763
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,2
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REFERENCES
| Brendan McKay, personal communication.
N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence).
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LINKS
| B. D. McKay, Isomorph-free exhaustive generation, J Algorithms, 26 (1998) 306-324.
Eric Weisstein's World of Mathematics, Square-Free Graph
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CROSSREFS
| Cf. A077269.
Sequence in context: A100132 A176720 A088457 * A125809 A000117 A006771
Adjacent sequences: A006783 A006784 A006785 * A006787 A006788 A006789
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KEYWORD
| nonn,changed
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AUTHOR
| N. J. A. Sloane (njas(AT)research.att.com).
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EXTENSIONS
| 2 more terms (from the McKay paper) from Vladeta Jovovic (vladeta(AT)eunet.rs), May 17 2008
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