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Sequence and first differences together list all positive numbers exactly once
OFFSET 1,2 COMMENTS This is the lexicographically earliest sequence that together with its first differences (A030124) contains every positive integer exactly once. Hofstadter introduces this sequence in his discussion of Scott Kim's "FIGURE-FIGURE" drawing.
In view of the definition of A075326: start with a(0) = 0, and extend by rule that the next term is the sum of the predecessor and the most recent non-member of the sequence. E. Angelini, "Jeux de suites", in Dossier Pour La Science, pp. D. R. Hofstadter, Goedel, Escher, Bach: an Eternal Golden Braid, Random House, 1980, p. 73.
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