A200678 Partial sums of A200675.

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

Table of n, a(n) for n=1..52.

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.

Index entries for linear recurrences with constant coefficients, signature (1,0,0,2,-2).

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

Cf. A027383, A200672, A200675.

Sequence in context: A100497 A191283 A341016 * A088881 A020697 A175381

Adjacent sequences: A200675 A200676 A200677 * A200679 A200680 A200681

Keyword

nonn

Author

Jeremy Gardiner, Nov 20 2011

Status

approved