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A200678
Partial sums of A200675.
1
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
OFFSET
1,2
COMMENTS
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.
LINKS
M. Szymczak, R. J. Cohen and A. M. S. Richards, Full polarization structure of the OH main-line maser envelopes of W Hydrae, Monthly Notices of the Royal Astronomical Society, Volume 297, Issue 4, pp. 1151-1162.
FORMULA
G.f.: x*(1+x)*(1+x^2) / ( (x-1)*(2*x^4-1) ). - R. J. Mathar, Nov 21 2011
EXAMPLE
a(5) = 1+1+1+1+2 = 6.
PROG
(BASIC) for i=0 to 12 : for j=1 to 4 : s=s+2^i : print s : next j : next i
CROSSREFS
KEYWORD
nonn
AUTHOR
Jeremy Gardiner, Nov 20 2011
STATUS
approved