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A246988 Number of isomorphism classes of oriented matroids of dimension n and cardinality n+3. 1
1, 4, 12, 25, 50, 91, 164 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,2
LINKS
Table of n, a(n) for n=1..7.
Lukas Finschi, Homepage of Oriented Matroids
CROSSREFS
A diagonal of A063804.
Sequence in context: A008264 A000297 A078618 * A304843 A062883 A364373
Adjacent sequences: A246985 A246986 A246987 * A246989 A246990 A246991
KEYWORD
nonn,more
AUTHOR
N. J. A. Sloane, Sep 17 2014
EXTENSIONS
a(4) corrected by Andrey Zabolotskiy, Mar 26 2023
STATUS
approved

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Last modified May 12 17:58 EDT 2024. Contains 372493 sequences. (Running on oeis4.)