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A098852 Number of triangle-free self-dual 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, 307 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,18

REFERENCES

A. Betten, G. Brinkmann and T. Pisanski, Counting symmetric configurations v_3, Discrete Appl. Math., 99 (2000), 331-338.

LINKS

Table of n, a(n) for n=1..21.

CROSSREFS

Cf. A001403, A100001, A023994.

Sequence in context: A264152 A098854 A056787 * A274482 A274277 A120592

Adjacent sequences:  A098849 A098850 A098851 * A098853 A098854 A098855

KEYWORD

nonn,hard

AUTHOR

N. J. A. Sloane, Nov 05 2004

STATUS

approved

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Last modified September 26 04:27 EDT 2017. Contains 292502 sequences.