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A366220
Number of unlabeled graphs on n vertices without 4-cycles or 5-cycles.
1
1, 2, 4, 8, 17, 41, 100, 267, 772, 2442, 8512, 33076, 143430, 697037, 3791763, 23043296, 155896190, 1169641637, 9693805936
OFFSET
1,2
COMMENTS
Disconnected graphs are included.
CROSSREFS
Cf. A366223 (biconnected graphs in the same class).
Sequence in context: A332398 A307555 A104879 * A331686 A373632 A156805
KEYWORD
nonn,hard,more
AUTHOR
Brendan McKay, Oct 04 2023
STATUS
approved