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A079468
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Number of unlabeled and connected graphs on n vertices which have no induced subgraph isomorphic to the 'fork' (fork = 4 vertices forming a path with a fifth vertex adjacent only to one of the non-end vertices).
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0
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1, 1, 2, 6, 20, 89, 446, 2724, 19877, 190403, 2605863, 53510680, 1624371850
(list;
graph;
refs;
listen;
history;
text;
internal format)
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OFFSET
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1,3
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LINKS
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F. Hüffner, tinygraph, software for generating integer sequences based on graph properties, version b882bc9.
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CROSSREFS
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KEYWORD
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more,nonn
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AUTHOR
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EXTENSIONS
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More terms added using tinygraph by Falk Hüffner, Jan 12 2016
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STATUS
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approved
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