login
Number of unlabeled graphs on n vertices without 4-cycles or 5-cycles.
1

%I #14 Oct 05 2023 08:37:46

%S 1,2,4,8,17,41,100,267,772,2442,8512,33076,143430,697037,3791763,

%T 23043296,155896190,1169641637,9693805936

%N Number of unlabeled graphs on n vertices without 4-cycles or 5-cycles.

%C Disconnected graphs are included.

%Y Cf. A366223 (biconnected graphs in the same class).

%K nonn,hard,more

%O 1,2

%A _Brendan McKay_, Oct 04 2023