> however I can't see how the sequences align - am I missing something? Comparing recurrences, the difference is the clearest: %F A073059 a(2n) = 0, a(4n+3) = 1, a(4n+1) = a(n). %F A096268 a(2n) = 0, a(4n+1) = 1, a(4n+3) = a(n). The last line was submitted only yesterday! ralf