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A263929
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Number of permutations that are sortable with two stacks in series.
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1
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1, 1, 2, 6, 24, 120, 720, 5018, 39374, 337816, 3092691, 29659731, 294107811, 2988678546, 30935695794, 324832481490, 3450158410649, 36993206191004, 399827092167771, 4351269802153188
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