**Derivative of n: write n in binary, replace each pair of adjacent bits by their mod 2 sum (a(0)=a(1)=0 by convention). Also n XOR (n shift 1).**

*0, 0, 1, 0, 2, 3, 1, 0, 4, 5, 7, 6, 2, 3, 1, 0, 8, 9, 11, 10, 14, 15, 13, 12, 4, 5, 7, 6, 2, 3, 1*

*3 seqfan posts*

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

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