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%I #12 Mar 04 2020 05:54:16
%S 0,0,0,0,0,0,0,0,0,0,0,0,0,0,1,0,1,2,6,40,307
%N Number of triangle-free self-dual configurations of type (n_3).
%H A. Betten, G. Brinkmann and T. Pisanski, <a href="https://doi.org/10.1016/S0166-218X(99)00143-2">Counting symmetric configurations v_3</a>, Discrete Appl. Math., 99 (2000), 331-338.
%Y Cf. A001403, A100001, A023994.
%K nonn,hard,more
%O 1,18
%A _N. J. A. Sloane_, Nov 05 2004