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Search: id:A128055
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| 1, 1, 2, 4, 8, 32, 64, 64, 128, 256, 512, 2048, 4096, 4096, 8192, 16384, 32768, 131072, 262144, 262144, 524288, 1048576, 2097152, 8388608, 16777216, 16777216, 33554432, 67108864, 134217728, 536870912, 1073741824
(list; graph; listen)
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OFFSET
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0,3
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COMMENT
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A factor in A128056.
The signed sequence 1,1,2,-4,-8,-32,-64,-64,-128,256,512... is the Hankel transform of the doubled sequence 1,1,2,2,6,6,... of central binomial coefficients (A128014). [From Paul Barry (pbarry(AT)wit.ie), Sep 09 2008]
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FORMULA
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G.f.:(-1-16*x^4+4*x^3-4*x^2+x)/((2*x-1)*(4*x^2-2*x+1)*(4*x^2+2*x+1)) [From Maksym Voznyy (voznyy(AT)mail.ru), Aug 11 2009]
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CROSSREFS
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Sequence in context: A100083 A151406 A053147 this_sequence A061285 A102000 A165904
Adjacent sequences: A128052 A128053 A128054 this_sequence A128056 A128057 A128058
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KEYWORD
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easy,nonn
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AUTHOR
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Paul Barry (pbarry(AT)wit.ie), Feb 13 2007
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