A132346 - OEIS

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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.

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	`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 January 28 05:03 EST 2023. Contains 359850 sequences. (Running on oeis4.)