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Search: id:A110164
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| A110164 |
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Expansion of (1-x^2)/(1+2x). |
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+0
4
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| 1, -2, 3, -6, 12, -24, 48, -96, 192, -384, 768, -1536, 3072, -6144, 12288, -24576, 49152, -98304, 196608, -393216, 786432, -1572864, 3145728, -6291456, 12582912, -25165824, 50331648, -100663296, 201326592, -402653184, 805306368, -1610612736, 3221225472
(list; graph; listen)
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OFFSET
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0,2
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COMMENT
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Diagonal sums of Riordan array ((1-x)/(1+x),x/(1+x)^2), A110162.
The positive sequence with g.f. (1-x^2)/(1-2x) gives the row sums of the Riordan array (1+x,x/(1-x)). - Paul Barry (pbarry(AT)wit.ie), Jul 18 2005
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MATHEMATICA
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CoefficientList[Series[(1 - x^2)/(1 + 2x), {x, 0, 33}], x] (from Robert G. Wilson v (rgwv(at)rgwv.com), Jul 08 2006)
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CROSSREFS
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Cf. A098011.
Sequence in context: A049890 A042950 A098011 this_sequence A035055 A119559 A045761
Adjacent sequences: A110161 A110162 A110163 this_sequence A110165 A110166 A110167
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KEYWORD
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easy,sign
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AUTHOR
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Paul Barry (pbarry(AT)wit.ie), Jul 14 2005
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