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A098851
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Number of triangle-free configurations of type (n_3).
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3
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0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 1, 4, 14, 162, 4713
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,18
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REFERENCES
| 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.
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CROSSREFS
| Cf. A001403.
Sequence in context: A006824 A162077 A111266 * A080986 A132555 A129220
Adjacent sequences: A098848 A098849 A098850 * A098852 A098853 A098854
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KEYWORD
| nonn,hard
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AUTHOR
| N. J. A. Sloane (njas(AT)research.att.com).
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