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A077953
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Expansion of 1/(1-x+2*x^2-2*x^3).
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4
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1, 1, -1, -1, 3, 3, -5, -5, 11, 11, -21, -21, 43, 43, -85, -85, 171, 171, -341, -341, 683, 683, -1365, -1365, 2731, 2731, -5461, -5461, 10923, 10923, -21845, -21845, 43691, 43691, -87381, -87381, 174763, 174763, -349525, -349525, 699051, 699051, -1398101, -1398101, 2796203, 2796203, -5592405
(list; graph; refs; listen; history; internal format)
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OFFSET
| 0,5
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COMMENTS
| Essentially the same as A077980.
a(n) = A077925(floor(n/2)-1) for n>1. [From Reinhard Zumkeller (reinhard.zumkeller(AT)gmail.com), Oct 07 2008]
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FORMULA
| a(n+1) = a(n) - 2*a(n-1) + 2*a(n-2). [From Reinhard Zumkeller (reinhard.zumkeller(AT)gmail.com), Oct 07 2008]
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CROSSREFS
| A007420. [From Reinhard Zumkeller (reinhard.zumkeller(AT)gmail.com), Oct 07 2008]
Sequence in context: A124114 A077893 * A077980 A146245 A171710 A161220
Adjacent sequences: A077950 A077951 A077952 * A077954 A077955 A077956
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KEYWORD
| sign
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AUTHOR
| N. J. A. Sloane (njas(AT)research.att.com), Nov 17 2002, Jun 17 2007
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