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A005594
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States of a dynamic storage system.
(Formerly M1080)
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4
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1, 2, 4, 7, 14, 26, 59, 122, 284, 647, 1528, 3602, 8679, 20882, 50824, 124055, 304574, 750122, 1855099, 4600202, 11442086, 28527447, 71292604, 178526882, 447919419, 1125750146, 2833906684, 7144450567, 18036423974
(list;
graph;
refs;
listen;
history;
text;
internal format)
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OFFSET
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0,2
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REFERENCES
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N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence).
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LINKS
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FORMULA
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Also "CIK" (necklace, indistinct, unlabeled) transform of 2, 1, 1, 1, ...
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MATHEMATICA
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nmax = 30;
f[x_] = Sum[n*x^n, {n, 1, nmax}];
gf = Sum[(EulerPhi[n]/n)*Log[1/(1 - f[x^n])] + O[x]^nmax, {n, 1, nmax}];
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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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