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XOR is A003987.
Table of n, a(n) for n=1..47.
Cf. Setwise difference of A115767 and A048719 ? A115769 shows this sequence in binary.
Sequence in context: A026037 A266088 A122613 * A242958 A005015 A070069
Adjacent sequences: A115765 A115766 A115767 * A115769 A115770 A115771
Antti Karttunen, Jan 30 2006