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A003036 Number of simplicial arrangements of n lines in the plane (the lines do not pass through a common point, all cells are triangles).
(Formerly M0223)
5
1, 1, 1, 2, 2, 2, 2, 4, 2, 4, 5, 5, 6 (list; graph; refs; listen; history; text; internal format)
OFFSET

3,4

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. 7.

N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence).

LINKS

Table of n, a(n) for n=3..15.

CROSSREFS

Cf. A048872, A048873.

Sequence in context: A270438 A331308 A318836 * A089818 A067025 A049047

Adjacent sequences:  A003033 A003034 A003035 * A003037 A003038 A003039

KEYWORD

nonn,nice,more

AUTHOR

N. J. A. Sloane

STATUS

approved

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Last modified January 25 03:49 EST 2020. Contains 331241 sequences. (Running on oeis4.)