cp's OEIS Frontend

A319010 a(0) = 0, a(1) = 1; for n >= 1, a(2*n) = a(2*n-1), a(2*n+1) = 2*(n - a(n)).

%I A319010 #17 Sep 25 2018 11:55:30
%S A319010 0,1,1,0,0,2,2,6,6,8,8,6,6,8,8,2,2,4,4,2,2,4,4,10,10,12,12,10,10,12,
%T A319010 12,26,26,28,28,26,26,28,28,34,34,36,36,34,34,36,36,26,26,28,28,26,26,
%U A319010 28,28,34,34,36,36,34,34,36,36,10,10,12,12,10,10,12,12,18,18,20,20,18,18,20,20
%N A319010 a(0) = 0, a(1) = 1; for n >= 1, a(2*n) = a(2*n-1), a(2*n+1) = 2*(n - a(n)).
%H A319010 Altug Alkan, <a href="/A319010/b319010.txt">Table of n, a(n) for n = 0..8190</a>
%H A319010 Altug Alkan, <a href="/A319010/a319010.png">An image from line plot of (a(n), A318190(n)) for n = 1..2^12-2</a>
%o A319010 (PARI) a = vector(100); print1(0", "); for(k=1, #a, print1 (a[k]=if(k==1, 1, my (n=k\2); if (k%2==0, a[2*n-1], 2*(n-a[n])))", "));
%o A319010 (PARI) a(n) = if(n<=1, n, if(n%2==0, a(n-1),2*((n-1)/2-a((n-1)/2))));
%Y A319010 Cf. A002487, A303404, A318190.
%K A319010 nonn,easy,look
%O A319010 0,6
%A A319010 _Altug Alkan_, Sep 07 2018