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A345246
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Number of 2-connected unlabeled simple graphs with no triangles.
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1
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1, 2, 6, 16, 78, 415, 3374, 35860, 524386, 10193061, 263036202, 8948113645, 400280198048
(list;
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listen;
history;
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internal format)
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OFFSET
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4,2
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LINKS
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EXAMPLE
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For n=4 the only example is a 4-cycle.
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CROSSREFS
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Cf. A002218 all 2-connected graphs.
Cf. A024607 all connected triangle-free graphs.
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KEYWORD
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nonn,hard,more
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AUTHOR
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STATUS
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approved
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