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A210714
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Number of disconnected regular simple graphs on n vertices with girth exactly 4.
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1
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0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 1, 1, 3, 2, 5, 3, 15, 5, 44, 10, 203, 47, 1415, 1710, 27771, 197951, 2613710, 33117920, 463707092, 6709514282, 102306345333, 1597440872721
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listen;
history;
text;
internal format)
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OFFSET
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0,13
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LINKS
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FORMULA
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MATHEMATICA
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A[s_Integer] := With[{s6 = StringPadLeft[ToString[s], 6, "0"]}, Cases[ Import["https://oeis.org/A" <> s6 <> "/b" <> s6 <> ".txt", "Table"], {_, _}][[All, 2]]];
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CROSSREFS
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KEYWORD
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nonn,more,hard
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AUTHOR
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EXTENSIONS
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a(31) corrected by the author, propagated from A185244, Jan 05 2013
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STATUS
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approved
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