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A055463
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a(n) = a(n-1)*2*a(n-2)-3*a(n-3)
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0
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0, 1, 2, 4, 13, 98, 2536, 497017, 2520869930, 2505830419990012, 12633745110864184300787269, 63316045634407119326463714272245870904666, 1599837563945889048330164752080268110156603845860584259478831024272
(list; graph; refs; listen; history; internal format)
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