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A287694 Number of not-necessarily connected simple chordless graphs on n vertices. 1
1, 2, 4, 9, 21, 56, 158, 493, 1658 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,2
LINKS
Eric Weisstein's World of Mathematics, Chordless Graph
EXAMPLE
1 node: K_1 (1 graph)
2 nodes: \bar K_2, P_2 = K_2 (2 graphs)
3 nodes: \bar K_3, K_1\cup K_2, P_3, C_3 = K_3 (4 graphs)
Here, \bar denotes graph complementation and \cup graph unioning.
CROSSREFS
Sequence in context: A148073 A057513 A006080 * A148074 A130866 A123458
KEYWORD
nonn,more
AUTHOR
Eric W. Weisstein, May 30 2017
STATUS
approved

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Last modified February 25 15:54 EST 2024. Contains 370332 sequences. (Running on oeis4.)