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A075545
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Number of connected circulant graphs on n nodes.
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4
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1, 1, 1, 2, 2, 5, 3, 8, 6, 16, 7, 38, 13, 43, 40, 72, 35, 178, 59, 314, 195, 407, 187, 1256, 420, 1385, 920, 3054, 1181, 8702, 2191, 8280, 6759, 16423, 11138, 46552, 14601, 58227, 44409, 135784, 52487, 354951, 99879, 432158, 351374, 762419, 364723, 2121560, 798948, 3355968
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OFFSET
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1,4
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COMMENTS
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LINKS
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FORMULA
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MATHEMATICA
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CountDistinct /@ Table[Select[CanonicalGraph[CirculantGraph[n, #]] & /@ Subsets[Range[Floor[n/2]]], ConnectedGraphQ], {n, 25}] (* Eric W. Weisstein, May 13 2017 *)
A049287 = Cases[Import["https://oeis.org/A049287/b049287.txt", "Table"], {_, _}][[All, 2]];
a[n_] := Sum[MoebiusMu[n/d] A049287[[d]], {d, Divisors[n]}];
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CROSSREFS
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KEYWORD
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nonn
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AUTHOR
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EXTENSIONS
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STATUS
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approved
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