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1, 2, 3, 4, 6, 8, 10, 12, 16, 20, 24, 28, 36, 44, 52, 60, 76, 92, 108, 124, 156, 188, 220, 252, 316, 380, 444, 508, 636, 764, 892, 1020, 1276, 1532, 1788, 2044, 2556, 3068, 3580, 4092, 5116, 6140, 7164, 8188, 10236, 12284, 14332, 16380, 20476, 24572, 28668, 32764
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refs;
listen;
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text;
internal format)
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OFFSET
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1,2
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COMMENTS
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Partial sums of powers of 2 repeated 4 times.
The first few terms of this sequence appear in the reference by Szymczak, et al., as contour levels in intensity maps of maser emissions.
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LINKS
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FORMULA
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G.f.: x*(1+x)*(1+x^2) / ( (x-1)*(2*x^4-1) ). - R. J. Mathar, Nov 21 2011
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EXAMPLE
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a(5) = 1+1+1+1+2 = 6.
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PROG
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(BASIC) for i=0 to 12 : for j=1 to 4 : s=s+2^i : print s : next j : next i
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CROSSREFS
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KEYWORD
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nonn
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AUTHOR
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STATUS
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approved
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