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. Gr\"{u}nbaum, Arrangements and Spreads. American Mathematical Society, Providence, RI, 1972, p. 4.

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

Sequence in context: A127837 A004249 A121510 this_sequence A041293 A041713 A042555

Adjacent sequences: A132343 A132344 A132345 this_sequence A132347 A132348 A132349

nonn,nice,more

N. J. A. Sloane (njas(AT)research.att.com), Nov 09 2007