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A361584
Number of digraphs on n unlabeled nodes whose strongly connected components are directed cycles or single vertices.
2
1, 1, 3, 12, 88, 1239, 36540, 2226595, 277421616, 69974281748, 35535207035048, 36224521019293188, 74004483908461354689, 302712665772844097945072, 2477999475270966827490305948, 40583406022745170376459610683073, 1329552679157905406495248763876363056
OFFSET
0,3
FORMULA
a(n) >= A361583(n).
PROG
(PARI) A361584seq(16) \\ See PARI link in A350794 for program code.
CROSSREFS
The labeled version is A011266.
Cf. A350794, A361583, A361585 (without single vertex components).
Sequence in context: A174463 A367143 A361583 * A124191 A065087 A366733
KEYWORD
nonn
AUTHOR
Andrew Howroyd, Mar 16 2023
STATUS
approved