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Search: id:A123344
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| A123344 |
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Expansion of (1+3x)/(1+2x). |
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+0
4
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| 1, 1, -2, 4, -8, 16, -32, 64, -128, 256, -512, 1024, -2048, 4096, -8192, 16384, -32768, 65536, -131072, 262144, -524288, 1048576, -2097152, 4194304, -8388608, 16777216, -33554432, 67108864, -134217728, 268435456, -536870912, 1073741824, -2147483648
(list; graph; listen)
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OFFSET
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0,3
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COMMENT
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Inverse binomial transform of A000034 . Hankel transform is [1,-3,0,0,0,0,0,0,0,0,...]
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FORMULA
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a(0)=1, a(n)=(-2)^(n-1) for n>0 .G.f.: (1+3x)/(1+2x).
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MAPLE
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a:=n->mul(-2, k=0..n): seq(a(n), n=-2..30); - Zerinvary Lajos (zerinvarylajos(AT)yahoo.com), Jan 22 2008
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CROSSREFS
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Cf. A011782(unsigned version).
Sequence in context: A166687 A011782 A034008 this_sequence A131577 A141531 A166444
Adjacent sequences: A123341 A123342 A123343 this_sequence A123345 A123346 A123347
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KEYWORD
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easy,sign
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AUTHOR
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Philippe DELEHAM (kolotoko(AT)wanadoo.fr), Oct 11 2006
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