0,4

See the illustration of initial terms in A048872.

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.

Table of n, a(n) for n=0..6.

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

nonn,nice,more

N. J. A. Sloane, Nov 09 2007

approved