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A164870
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The number of permutations of length n that can be sorted by 2 pop stacks in parallel.
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0
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1, 2, 6, 22, 84, 320, 1212, 4576, 17256, 65048, 245184, 924160, 3483408, 13129952, 49490592, 186544480, 703140672, 2650342784, 9989916864, 37654917376, 141932392320, 534984681344, 2016513669120, 7600829555200, 28649748728064
(list; graph; refs; listen; history; internal format)
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