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A082679
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Number of Lego towers, one piece per floor, where every floor is perpendicular to the one below it (so we have a kind of 3-dimensional zigzag pattern).
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1
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0, 1, 2, 6, 20, 69, 241, 845, 2966, 10414, 36568, 128409, 450913, 1583401, 5560186, 19524854, 68562444, 240760253, 845440977, 2968805845, 10425101678, 36608235998, 128551546480, 451414815601, 1585164405441
(list; graph; refs; listen; history; internal format)
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