References to A210025

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, otherwise add it to a(n).
1, 2, 4, 8, 16, 15, 9, 8, 3, 12, 4, 1, 2, 4, 8, 7, 5, 1, 9, 2, 7, 6, 15, 13, 6, 12, 11, 6, 5, 2, 8

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