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A200675
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Powers of 2 repeated 4 times.
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5
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1, 1, 1, 1, 2, 2, 2, 2, 4, 4, 4, 4, 8, 8, 8, 8, 16, 16, 16, 16, 32, 32, 32, 32, 64, 64, 64, 64, 128, 128, 128, 128, 256, 256, 256, 256, 512, 512, 512, 512, 1024, 1024, 1024, 1024, 2048, 2048, 2048, 2048, 4096, 4096, 4096, 4096
(list;
graph;
refs;
listen;
history;
text;
internal format)
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OFFSET
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0,5
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COMMENTS
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LINKS
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FORMULA
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a(n) = 2^floor(n/4).
G.f.: x*(1+x)*(1+x^2)/(1-2*x^4 ). - R. J. Mathar, Nov 21 2011
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EXAMPLE
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a(4) = 2^1 = 2.
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MATHEMATICA
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CoefficientList[Series[x*(1 + x)*(1 + x^2)/(1 - 2*x^4), {x, 0, 50}], x] (* or *) Table[2^(Floor[n/4]), {n, 0, 50}] (* G. C. Greubel, Apr 30 2017 *)
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PROG
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(Python)
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CROSSREFS
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KEYWORD
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nonn,easy
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AUTHOR
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EXTENSIONS
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STATUS
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approved
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