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%I #5 Jan 22 2022 18:31:01
%S 1,1,1,2,7,25,108,513,2690,15230,92361,594669,4040283,28817783,
%T 214898429,1669663193,13476692136,112722792293,974931812942,
%U 8702563358405,80039193725904,757342429877879,7362651015248190,73451961108974776,751144076656119144,7866092802569673370
%N Number of unlabeled digraphs with n arcs and a global source and sink.
%o (PARI) A350796seq(15) \\ See PARI link in A350794 for program code.
%Y Column sums of A350795.
%Y Cf. A350752, A350794, A350798, A350906, A350907.
%K nonn
%O 0,4
%A _Andrew Howroyd_, Jan 21 2022