login
The OEIS is supported by the many generous donors to the OEIS Foundation.

 

Logo
Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
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 (list; graph; refs; listen; history; text; internal format)
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
CROSSREFS
Equals A048872 + 1. Cf. A003036, A048873. Different from A121510.
Sequence in context: A004249 A268210 A121510 * A284530 A041293 A041713
KEYWORD
nonn,nice,more
AUTHOR
N. J. A. Sloane, Nov 09 2007
STATUS
approved

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

License Agreements, Terms of Use, Privacy Policy. .

Last modified March 29 03:39 EDT 2024. Contains 371264 sequences. (Running on oeis4.)