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%I #6 Aug 15 2019 16:40:35
%S 1,4,20,118,937,11936,272771,11992996,1018892793,165089910412,
%T 50502010570950,29054155189364119,31426485955571756316,
%U 64001015703946097640927,245935864153501211843554826
%N Number of n-node (unlabeled) graphs with girth 3.
%Y a(n) = A000088(n) - A006785(n).
%Y Cf. A128041, A128042, A128237-A128243.
%K nonn
%O 3,2
%A _Keith Briggs_, May 05 2007
%E Corrected and extended by _Martin Fuller_, May 01 2015
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