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A030768
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Row 2, where, at stage k>1, write i in row 1 and j in row 2, where i is the number of j's in rows 1 and 2, for j=m,m-1,...2,1, where m=max number in row 1 from stages 1 to k-1; stage 1 is 2 in row 1.
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2, 2, 1, 2, 1, 4, 3, 2, 1, 5, 4, 3, 2, 1, 7, 6, 5, 4, 3, 2, 1, 9, 8, 7, 6, 5, 4, 3, 2, 1, 12, 10, 9, 8, 7, 6, 5, 4, 3, 2, 1, 15, 13, 12, 10, 9, 8, 7, 6, 5, 4, 3, 2, 1, 18, 16, 15, 13, 12, 10, 9, 8, 7, 6, 5, 4, 3, 2, 1, 21, 19, 18, 16, 15, 13, 12, 11, 10, 9, 8
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