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%I #12 May 21 2018 03:15:28
%S 1,1,4,16,70,322,1556,39698,207217
%N Coefficients of g.f. for the class of C-trees.
%H Jessica Shi, <a href="https://pdfs.semanticscholar.org/c264/67cd4a5f0adee094d7c19fd8a08a78b46793.pdf">Enumeration of unlabeled graph classes: A study of tree decompositions and related approaches</a>, 2015.
%K nonn,more
%O 1,3
%A _N. J. A. Sloane_, Jan 17 2017