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A098854 Number of triangle-free self-polar configurations of type (n_3). 3
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 1, 2, 6, 40, 303 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,18

LINKS

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.

CROSSREFS

Cf. A001403, A098702, A023994.

Sequence in context: A264152 A333631 A337071 * A056787 A098852 A274482

Adjacent sequences:  A098851 A098852 A098853 * A098855 A098856 A098857

KEYWORD

nonn,hard,more

AUTHOR

N. J. A. Sloane, Nov 05 2004

STATUS

approved

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Last modified October 23 04:06 EDT 2021. Contains 348211 sequences. (Running on oeis4.)