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A164872
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The number of permutations of length n that can be sorted by 4 pop stacks in parallel
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0
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1, 2, 6, 24, 120, 718, 4884, 35546, 264590, 1969912, 14560996, 106781758, 778073440, 5643649364, 40811356112, 294554236798, 2123419108962, 15296729408614, 110149122090326, 792974948890068, 5707931771206042
(list; graph; refs; listen; history; internal format)
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