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Search: id:A005426
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| A005426 |
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Number of linear geometries on n points with <=3 points per line.
(Formerly M0292)
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+0
1
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| 1, 1, 1, 2, 2, 3, 5, 11, 32, 163, 1680
(list; graph; listen)
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OFFSET
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0,4
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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).
D. G. Glynn, Rings of geometries II, J. Combin. Theory, A 49 (1988), 26-66.
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CROSSREFS
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Sequence in context: A049907 A078445 A127166 this_sequence A014644 A089541 A065843
Adjacent sequences: A005423 A005424 A005425 this_sequence A005427 A005428 A005429
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KEYWORD
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nonn,hard,nice
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AUTHOR
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N. J. A. Sloane (njas(AT)research.att.com), Simon Plouffe (simon.plouffe(AT)gmail.com)
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