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A113240 Expansion of (1/(1-x))*sum(k>=2,x^k/(1-2x^k)). 0
1, 2, 5, 6, 13, 14, 25, 30, 49, 50, 97, 98, 165, 186, 325, 326, 621, 622, 1161, 1230, 2257, 2258, 4481, 4498, 8597, 8858, 17125, 17126, 34077, 34078, 66985, 68014, 133553, 133634, 267057, 267058, 529205, 533306, 1058261, 1058262, 2115133 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,2

LINKS

Table of n, a(n) for n=0..40.

FORMULA

a(n)=sum{k=0..floor(n/2), floor((n-k+1)/(k+1))*2^k}.

CROSSREFS

Cf. A002541.

Sequence in context: A100613 A070911 A276082 * A098376 A028259 A327472

Adjacent sequences:  A113237 A113238 A113239 * A113241 A113242 A113243

KEYWORD

easy,nonn

AUTHOR

Paul Barry, Oct 19 2005

STATUS

approved

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Last modified March 31 19:37 EDT 2020. Contains 333151 sequences. (Running on oeis4.)