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A002862
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Number of nonisomorphic connected functions with no fixed points, or proper rings with n edges.
(Formerly M1403 N0547)
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2
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0, 1, 2, 5, 11, 31, 77, 214, 576, 1592, 4375, 12183, 33864, 94741, 265461, 746372, 2102692, 5938630, 16803610, 47639902, 135288198, 384812502, 1096141974, 3126648842, 8929715592, 25533447030
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,3
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REFERENCES
| R. A. Fisher, Contributions to Mathematical Statistics, Wiley, 1950, 41.399.
N. J. A. Sloane, A Handbook of Integer Sequences, Academic Press, 1973 (includes this sequence).
N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence).
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CROSSREFS
| (A002861) minus (A000081).
Sequence in context: A139466 A139467 A124481 * A190865 A139464 A174537
Adjacent sequences: A002859 A002860 A002861 * A002863 A002864 A002865
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KEYWORD
| nonn,nice
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AUTHOR
| N. J. A. Sloane (njas(AT)research.att.com).
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EXTENSIONS
| More terms from and better description from Christian Bower (bowerc(AT)usa.net)
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