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%I #23 Jun 24 2023 13:42:13
%S 0,0,0,1,1,6,17,69,239,962,3864,17049,79607,403758,2209386,13138818,
%T 84841130,595825731
%N Number of n-node (unlabeled) connected graphs with girth 6.
%o (nauty) geng -ctfq $n | countg -qg6 --ng # _Martin Fuller_, May 03 2015
%Y Cf. A128041, A128042.
%Y Cf. A128236, A128237, A128238, A128239, A128240, A128241, A128242.
%K nonn,more
%O 3,6
%A _Keith Briggs_, May 05 2007
%E Corrected and extended by _Martin Fuller_, May 01 2015
%E a(18)-a(20) added by _Georg Grasegger_, May 02 2023