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Number of n-node unlabeled connected digraphs whose underlying graphs are mating graphs, cf. A006024.
2

%I #3 May 10 2013 12:45:40

%S 1,2,7,102,5034,886456

%N Number of n-node unlabeled connected digraphs whose underlying graphs are mating graphs, cf. A006024.

%K more,nonn

%O 1,2

%A Goran Kilibarda, Zoran Maksimovic, _Vladeta Jovovic_, Jan 22 2005