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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
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1, 1, 1, 2, 2, 3, 5, 11, 32, 163, 1680
(list; graph; refs; listen; history; internal format)
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OFFSET
| 0,4
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REFERENCES
| D. G. Glynn, Rings of geometries II, J. Combin. Theory, A 49 (1988), 26-66.
N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence).
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CROSSREFS
| Sequence in context: A049907 A078445 A127166 * A014644 A089541 A065843
Adjacent sequences: A005423 A005424 A005425 * A005427 A005428 A005429
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KEYWORD
| nonn,hard,nice
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AUTHOR
| N. J. A. Sloane (njas(AT)research.att.com), Simon Plouffe (simon.plouffe(AT)gmail.com)
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