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A098851
Number of triangle-free configurations of type (n_3).
3
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 1, 4, 14, 162, 4713, 157211
OFFSET
1,18
LINKS
A. Alazemi and A. Betten, Classification of Triangle-Free 22_3 Configurations, International Journal of Combinatorics, Volume 2010, Article ID 767361.
A. Betten, G. Brinkmann and T. Pisanski, Counting symmetric configurations v_3, Discrete Appl. Math., 99 (2000), 331-338.
M. Boben et al., Small triangle-free configurations of points and lines, Discrete Comput. Geom., 35 (2006), 405-427.
CROSSREFS
Cf. A001403.
Sequence in context: A162077 A247526 A111266 * A080986 A132555 A129220
KEYWORD
nonn,more,hard
EXTENSIONS
a(22) from Abdullah Alazemi, Sep 05 2021
STATUS
approved