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A076323
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Number of connected 4-colorable (i.e., chromatic number <= 4) simple graphs on n nodes.
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7
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1, 1, 2, 6, 20, 107, 801, 10227, 231228, 9708788, 743177051
(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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FORMULA
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MATHEMATICA
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A076316 = Cases[Import["https://oeis.org/A076316/b076316.txt", "Table"], {_, _}][[All, 2]];
(* EulerInvTransform is defined in A022562 *)
EulerInvTransform[A076316] (* Jean-François Alcover, Sep 25 2019, updated Mar 17 2020 *)
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CROSSREFS
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KEYWORD
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nonn,more
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AUTHOR
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EXTENSIONS
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STATUS
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approved
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