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A132346
Number of nonisomorphic arrangements of n lines in the real projective plane, including the arrangement where all the lines pass through a common point.
3
1, 1, 1, 2, 3, 5, 18
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OFFSET
0,4
COMMENTS
See the illustration of initial terms in
A048872
.
REFERENCES
J. E. Goodman and J. O'Rourke, editors, Handbook of Discrete and Computational Geometry, CRC Press, 1997, p. 102.
B. Grünbaum, Arrangements and Spreads. American Mathematical Society, Providence, RI, 1972, p. 4.
LINKS
Table of n, a(n) for n=0..6.
CROSSREFS
Equals
A048872
+ 1. Cf.
A003036
,
A048873
. Different from
A121510
.
Sequence in context:
A004249
A268210
A121510
*
A284530
A041293
A041713
Adjacent sequences:
A132343
A132344
A132345
*
A132347
A132348
A132349
KEYWORD
nonn
,
nice
,
more
AUTHOR
N. J. A. Sloane
, Nov 09 2007
STATUS
approved
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Last modified March 29 03:39 EDT 2024. Contains 371264 sequences. (Running on oeis4.)