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%I #12 Apr 04 2015 21:49:03
%S 0,1,2,3,4,5,6,7,8,9,11,10,13,12,15,14,17,16,20,18,22,19,24,21,26,23,
%T 29,25,31,27,33,28,35,30,38,32,40,34,42,36,44,37,47,39,49,41,51,43,53,
%U 45,56,46,58,48,60,50,62,52,65,54,67,55,69,57,71,59,74,61,76,63,78,64,80
%N Lexicographically earliest permutation of the natural numbers with alternating parities of digital roots in decimal representation.
%C inverse: A113220; A113219 = a(a(n));
%C A113217(a(n)) = A000035(n).
%H <a href="/index/Per#IntegerPermutation">Index entries for sequences that are permutations of the natural numbers</a>
%H Eric Weisstein's World of Mathematics, <a href="http://mathworld.wolfram.com/DigitalRoot.html">Digital Root</a>
%Y Cf. A010888.
%K nonn,easy,base
%O 0,3
%A _Reinhard Zumkeller_, Oct 18 2005