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A099211 a(n)=-2a(n-1)+4a(n-3). 1
1, -2, 4, -4, 0, 16, -48, 96, -128, 64, 256, -1024, 2304, -3584, 3072, 3072, -20480, 53248, -94208, 106496, 0, -376832, 1179648, -2359296, 3211264, -1703936, -6029312, 24903680, -56623104, 89128960, -78643200, -69206016 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,2

LINKS

Table of n, a(n) for n=0..31.

Index entries for linear recurrences with constant coefficients, signature (-2,0,4).

FORMULA

G.f.: 1/(1+2x-4x^3); a(n)=A099212(n+4)/4.

CROSSREFS

Sequence in context: A090132 A199051 A300190 * A261761 A300269 A094225

Adjacent sequences:  A099208 A099209 A099210 * A099212 A099213 A099214

KEYWORD

easy,sign

AUTHOR

Paul Barry, Oct 06 2004

STATUS

approved

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Last modified October 21 10:52 EDT 2021. Contains 348150 sequences. (Running on oeis4.)