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A005426 Number of linear geometries on n points with <=3 points per line.
(Formerly M0292)
+0
1
1, 1, 1, 2, 2, 3, 5, 11, 32, 163, 1680 (list; graph; listen)
OFFSET

0,4

REFERENCES

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.

CROSSREFS

Sequence in context: A049907 A078445 A127166 this_sequence A014644 A089541 A065843

Adjacent sequences: A005423 A005424 A005425 this_sequence A005427 A005428 A005429

KEYWORD

nonn,hard,nice

AUTHOR

N. J. A. Sloane (njas(AT)research.att.com), Simon Plouffe (simon.plouffe(AT)gmail.com)

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Last modified November 25 20:09 EST 2009. Contains 167514 sequences.


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