**Number of 1's when k is written in base b for all b and k satisfying 2<=b<=n+1, 1<=k<=n.**

*1, 2, 5, 9, 15, 21, 30, 36, 46, 56, 68, 79, 95, 108, 123, 137, 153, 166, 184, 199, 220*

*1 seqfan posts*

Index of A-numbers in seqfan: by ascending order by month by frequency by keyword

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