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 A180200 a(n) = if n<2 then n else 2*m + 1 - (n mod 2 + m mod 2) mod 2, with m=a(floor(n/2)). 6
 0, 1, 2, 3, 5, 4, 6, 7, 10, 11, 9, 8, 13, 12, 14, 15, 21, 20, 22, 23, 18, 19, 17, 16, 26, 27, 25, 24, 29, 28, 30, 31, 42, 43, 41, 40, 45, 44, 46, 47, 37, 36, 38, 39, 34, 35, 33, 32, 53, 52, 54, 55, 50, 51, 49, 48, 58, 59, 57, 56, 61, 60, 62, 63, 85, 84, 86, 87, 82, 83, 81, 80, 90 (list; graph; refs; listen; history; text; internal format)
 OFFSET 0,3 COMMENTS Permutation of the natural numbers with inverse A180201; A180198(n) = a(a(n)); a(A180199(n)) = A180199(a(n)) = A180201(n); a(A075427(n)) = A075427(n). LINKS R. Zumkeller, Table of n, a(n) for n = 0..1023 CROSSREFS Cf. A006068, A054429. Sequence in context: A123917 A154444 A154443 * A121216 A132196 A153150 Adjacent sequences:  A180197 A180198 A180199 * A180201 A180202 A180203 KEYWORD nonn AUTHOR Reinhard Zumkeller, Aug 15 2010 STATUS approved

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