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A147675
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Divide by 2, multiply by 4, repeat.
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4
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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; internal format)
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OFFSET
| 1,1
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COMMENTS
| A147675-A147678 are from a quiz that someone asked me to help them with.
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FORMULA
| a(n)=2*a(n-2) = 5*A135530(n-1). G.f.: -5*x*(2+x)/(-1+2*x^2). [From R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Apr 22 2009]
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CROSSREFS
| Sequence in context: A158486 A040093 A046797 * A050136 A070291 A183132
Adjacent sequences: A147672 A147673 A147674 * A147676 A147677 A147678
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KEYWORD
| nonn
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AUTHOR
| N. J. A. Sloane (njas(AT)research.att.com), Apr 21 2009
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EXTENSIONS
| More terms from R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Apr 22 2009
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