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A063857 Total number of abstract order types of configurations of n points in dimensions 2 through n-1. 1
1, 4, 17, 157, 7420, 11403801 (list; graph; refs; listen; history; text; internal format)
OFFSET

3,2

LINKS

Table of n, a(n) for n=3..8.

L. Finschi, Homepage of Oriented Matroids

L. Finschi and K. Fukuda, Complete combinatorial generation of small point set configurations and hyperplane arrangements, pp. 97-100 in Abstracts 13th Canadian Conference on Computational Geometry (CCCG '01), Waterloo, Aug. 13-15, 2001.

CROSSREFS

Row sums of A063853.

Sequence in context: A072755 A320444 A129436 * A072654 A094545 A156633

Adjacent sequences:  A063854 A063855 A063856 * A063858 A063859 A063860

KEYWORD

nonn

AUTHOR

N. J. A. Sloane, Aug 26 2001

STATUS

approved

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Last modified January 17 12:33 EST 2020. Contains 330958 sequences. (Running on oeis4.)