|
Search: id:A018242
|
|
|
| A018242 |
|
Number of projective order types; number of simple arrangements of n lines. |
|
+0
2
|
|
| 1, 1, 1, 1, 1, 1, 4, 11, 135, 4381, 312114, 41693377
(list; graph; listen)
|
|
|
OFFSET
|
0,7
|
|
|
REFERENCES
|
J. E. Goodman and J. O'Rourke, editors, Handbook of Discrete and Computational Geometry, CRC Press, 1997, p. 102.
|
|
CROSSREFS
|
Cf. A006247, A006248, A063666.
Adjacent sequences: A018239 A018240 A018241 this_sequence A018243 A018244 A018245
Sequence in context: A004796 A125888 A055979 this_sequence A006248 A119571 A089920
|
|
KEYWORD
|
nonn
|
|
AUTHOR
|
njas
|
|
EXTENSIONS
|
a(11) from Franz Aurenhammer (auren(AT)igi.tu-graz.ac.at), Feb 05, 2002
|
|
|
Search completed in 0.002 seconds
|
