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Search: id:A122803
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| 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, 4294967296
(list; graph; listen)
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OFFSET
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0,2
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COMMENT
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Sum_{n>=0} 1/a(n) = 2/3 [From Jaume Oliver Lafont (joliverlafont(AT)gmail.com), Mar 01 2009]
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LINKS
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Franklin T. Adams-Watters, Table of n, (-2)^n for n = 0..1000
Index entries for sequences related to linear recurrences with constant coefficients
Tanya Khovanova, Recursive Sequences
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FORMULA
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a(n) = (-2)^n.
a(n) = - 4a(n-1) - 4a(n-2). - Tanya Khovanova (tanyakh(AT)yahoo.com), Feb 01 2007
a(n)=-2*a(n-1), n>0 ; a(0)=1 . G.f.: 1/(1+2x). [From Philippe DELEHAM (kolotoko(AT)wanadoo.fr), Nov 19 2008]
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MAPLE
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a:=n->mul(-2, k=0..n): seq(a(n), n=-1..31); - Zerinvary Lajos (zerinvarylajos(AT)yahoo.com), Jan 22 2008
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CROSSREFS
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Cf. A000079 (powers of 2).
Sequence in context: A141531 A166444 A084633 this_sequence A000079 A120617 A050732
Adjacent sequences: A122800 A122801 A122802 this_sequence A122804 A122805 A122806
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KEYWORD
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easy,sign
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AUTHOR
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Franklin T. Adams-Watters (FrankTAW(AT)Netscape.net), Sep 11 2006
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