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A350796
Number of unlabeled digraphs with n arcs and a global source and sink.
5
1, 1, 1, 2, 7, 25, 108, 513, 2690, 15230, 92361, 594669, 4040283, 28817783, 214898429, 1669663193, 13476692136, 112722792293, 974931812942, 8702563358405, 80039193725904, 757342429877879, 7362651015248190, 73451961108974776, 751144076656119144, 7866092802569673370
OFFSET
0,4
PROG
(PARI) A350796seq(15) \\ See PARI link in A350794 for program code.
CROSSREFS
Column sums of A350795.
Sequence in context: A150532 A074420 A005034 * A245157 A150533 A150534
KEYWORD
nonn
AUTHOR
Andrew Howroyd, Jan 21 2022
STATUS
approved