References to A038554

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

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