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A099212
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a(n)=-2a(n-1)+4a(n-3).
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2
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1, 0, 0, 4, -8, 16, -16, 0, 64, -192, 384, -512, 256, 1024, -4096, 9216, -14336, 12288, 12288, -81920, 212992, -376832, 425984, 0, -1507328, 4718592, -9437184, 12845056, -6815744, -24117248, 99614720
(list; graph; refs; listen; history; internal format)
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