**a(0)=1. Let S = string of digits of a(0),a(1),a(2),... To get a(n+1) (n>=0), subtract next element of S from a(n) if that would give a positive number different from a(0),...,a(n), otherwise add it to a(n).**

*1, 2, 4, 8, 16, 15, 9, 8, 3, 12, 4, 1, 0, 2, 6, 5, 5, 3, 9, 4, 9, 6, 15, 11, 2, 8, 7, 2, 1, 0, 2*

*1 seqfan posts*

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

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