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A147675 Divide by 2, multiply by 4, repeat. 4
10, 5, 20, 10, 40, 20, 80, 40, 160, 80, 320, 160, 640, 320, 1280, 640, 2560, 1280, 5120, 2560, 10240, 5120, 20480, 10240, 40960, 20480, 81920, 40960, 163840, 81920, 327680, 163840, 655360, 327680, 1310720, 655360, 2621440, 1310720, 5242880 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

A147675-A147678 are from a quiz that someone asked me to help them with.

LINKS

Table of n, a(n) for n=1..39.

FORMULA

From R. J. Mathar, Apr 22 2009: (Start)

a(n) = 2*a(n-2) = 5*A135530(n-1).

G.f.: -5*x*(2+x)/(-1+2*x^2). (End)

CROSSREFS

Sequence in context: A280154 A040093 A046797 * A070291 A183132 A141321

Adjacent sequences:  A147672 A147673 A147674 * A147676 A147677 A147678

KEYWORD

nonn

AUTHOR

N. J. A. Sloane, Apr 21 2009

EXTENSIONS

More terms from R. J. Mathar, Apr 22 2009

STATUS

approved

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Last modified October 22 06:02 EDT 2018. Contains 316432 sequences. (Running on oeis4.)