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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
OFFSET
0,2
FORMULA
G.f.: 1/(1+2x-4x^3); a(n)=A099212(n+4)/4.
CROSSREFS
Sequence in context: A090132 A199051 A300190 * A261761 A300269 A094225
KEYWORD
easy,sign
AUTHOR
Paul Barry, Oct 06 2004
STATUS
approved