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A098852
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Number of triangle-free self-dual 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, 2, 6, 40, 307
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OFFSET
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1,18
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LINKS
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Table of n, a(n) for n=1..21.
A. Betten, G. Brinkmann and T. Pisanski, Counting symmetric configurations v_3, Discrete Appl. Math., 99 (2000), 331-338.
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CROSSREFS
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Cf. A001403, A100001, A023994.
Sequence in context: A351739 A098854 A056787 * A274482 A274277 A120592
Adjacent sequences: A098849 A098850 A098851 * A098853 A098854 A098855
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KEYWORD
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nonn,hard,more
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AUTHOR
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N. J. A. Sloane, Nov 05 2004
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STATUS
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approved
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