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Omni-MATH / Let n be a positive integer. Find the number of permutations a₁, a₂, …a_(n) of the sequence 1, 2, … , n satisfying a₁≤2a₂≤3a₃≤…≤na_(n). · Discussion

Discussing Let n be a positive integer. Find the number of permutations a₁, a₂, …a_(n) of the sequence 1, 2, … , n satisfying a₁≤2a₂≤3a₃≤…≤na_(n). · Omni-MATH

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