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A099094
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a(n)=3a(n-2)+3a(n-3), a(0)=1,a(1)=0,a(2)=3.
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2
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1, 0, 3, 3, 9, 18, 36, 81, 162, 351, 729, 1539, 3240, 6804, 14337, 30132, 63423, 133407, 280665, 590490, 1242216, 2613465, 5498118, 11567043, 24334749, 51195483, 107705376, 226590696, 476702577, 1002888216, 2109879819, 4438772379
(list; graph; refs; listen; history; internal format)
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