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Number of unlabeled strongly connected oriented graphs with n arcs.
3

%I #5 Jan 14 2022 19:45:53

%S 1,0,0,1,1,3,7,27,120,590,3172,18291,112597,731646,5002261,35805035,

%T 267427870,2077890719,16753007782,139843832074,1206213748404,

%U 10731971520412,98340872850392,926788397662602,8971598464914888,89105060389927172,907030917078092542

%N Number of unlabeled strongly connected oriented graphs with n arcs.

%o (PARI) A350751seq(20) \\ See PARI link in A350489 for program code.

%Y Column sums of A350750.

%Y Cf. A350489, A350752.

%K nonn

%O 0,6

%A _Andrew Howroyd_, Jan 14 2022