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URL: https://oeis.org/A345249

⇱ A345249 - OEIS

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A345249
Number of labeled simple graphs on n vertices without cycles of length 4.
4
1, 2, 8, 54, 548, 7984, 163440, 4599908, 174204728, 8721120744, 568964631296, 47787888342520, 5112015062311008, 689824902243337856, 116423739687724785152, 24387469030487505651984, 6296486009090647137387200, 1991072810881504185092485408
OFFSET
1,2
CROSSREFS
EXP transform of A345248. Row sums of A352472.
A006786 counts isomorphism classes.
Cf. A213434, A352258 (loops allowed).
Sequence in context: A005155 A133316 A234301 * A005440 A183282 A139016
KEYWORD
nonn,hard
AUTHOR
Brendan McKay, Jun 12 2021
STATUS
approved