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A078069
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Expansion of (1-x)/(1+2*x+2*x^2).
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2
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1, -3, 4, -2, -4, 12, -16, 8, 16, -48, 64, -32, -64, 192, -256, 128, 256, -768, 1024, -512, -1024, 3072, -4096, 2048, 4096, -12288, 16384, -8192, -16384, 49152, -65536, 32768, 65536, -196608, 262144, -131072, -262144, 786432, -1048576, 524288, 1048576, -3145728, 4194304, -2097152, -4194304
(list; graph; refs; listen; history; internal format)
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OFFSET
| 0,2
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LINKS
| Index entries for sequences related to linear recurrences with constant coefficients
Tanya Khovanova, Recursive Sequences
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FORMULA
| a(n)=(-2)*(a(n-1)+a(n-2)), n>1 ; a(0)=1, a(1)=-3 . [From Philippe DELEHAM (kolotoko(AT)wanadoo.fr), Nov 19 2008]
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MATHEMATICA
| CoefficientList[Series[(1-x)/(1+2x+2x^2), {x, 0, 50}], x] (* or *) LinearRecurrence[{-2, -2}, {1, -3}, 50] (* From Harvey P. Dale, Jan 19 2012 *)
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CROSSREFS
| Cf. A090131.
Sequence in context: A174531 A021296 * A090131 A152833 A139525 A133570
Adjacent sequences: A078066 A078067 A078068 * A078070 A078071 A078072
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KEYWORD
| sign
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AUTHOR
| N. J. A. Sloane (njas(AT)research.att.com), Nov 17 2002
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