login
The OEIS Foundation is supported by donations from users of the OEIS and by a grant from the Simons Foundation.

 

Logo


Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A005426 Number of linear geometries on n points with <=3 points per line.
(Formerly M0292)
0
1, 1, 1, 2, 2, 3, 5, 11, 32, 163, 1680 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,4

REFERENCES

N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence).

LINKS

Table of n, a(n) for n=0..10.

D. G. Glynn, Rings of geometries II, J. Combin. Theory, A 49 (1988), 26-66.

CROSSREFS

Sequence in context: A078445 A127166 A103596 * A014644 A089541 A065843

Adjacent sequences:  A005423 A005424 A005425 * A005427 A005428 A005429

KEYWORD

nonn,hard,nice

AUTHOR

N. J. A. Sloane, Simon Plouffe

STATUS

approved

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recent
The OEIS Community | Maintained by The OEIS Foundation Inc.

License Agreements, Terms of Use, Privacy Policy. .

Last modified June 12 19:06 EDT 2021. Contains 344959 sequences. (Running on oeis4.)