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.

1, 1, 1, 2, 3, 5, 18

Offset: 0

Author

N. J. A. Sloane, Nov 09 2007

Keywords

• nonn
• nice
• more

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.

Crossrefs

Equals A048872 + 1. Cf. A003036, A048873. Different from A121510.