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Search: id:A094154
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| 1, 4, 54, 2246, 164950, 18423144, 2905943328, 615376173184, 168483518571798, 57926238289970076, 24434798429947993054, 12408968034664788792008, 7468360391233437715595634, 5256695596753687250025931048, 4278271932454694494134007741950, 3986830862631720154048770746485900
(list; graph; listen)
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OFFSET
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1,2
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REFERENCES
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S. W. Golomb and L. R. Welch, On the enumeration of polygons, Amer. Math. Monthly, 67 (1960), 349-353.
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FORMULA
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See Maple line.
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MAPLE
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with(numtheory); f:=proc(n) local t1, d; t1:=0; for d from 1 to n do if n mod d = 0 then t1:=t1+phi(n/d)^2*d!*(n/d)^d; fi; od: t1/(2*n^2); end;
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CROSSREFS
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Cf. A000939, A094155.
Sequence in context: A138459 A111161 A003955 this_sequence A125531 A095209 A107101
Adjacent sequences: A094151 A094152 A094153 this_sequence A094155 A094156 A094157
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KEYWORD
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nonn
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AUTHOR
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N. J. A. Sloane (njas(AT)research.att.com), May 05 2004
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