A025481 a(0) = 0; a(n) = a(n/2)/2 if n = a(n/2) = 0 (mod 2); a(n) = a(n-1)+1 otherwise.

0, 1, 2, 3, 1, 2, 3, 4, 5, 6, 1, 2, 3, 4, 2, 3, 4, 5, 3, 4, 5, 6, 1, 2, 3, 4, 2, 3, 1, 2, 3, 4, 2, 3, 4, 5, 6, 7, 2, 3, 4, 5, 3, 4, 5, 6, 1, 2, 3, 4, 2, 3, 1, 2, 3, 4, 5, 6, 1, 2, 3, 4, 2, 3, 1, 2, 3, 4, 2, 3, 4, 5, 3, 4, 5, 6, 1, 2, 3, 4, 2, 3, 4, 5, 6, 7, 2, 3, 4, 5, 3, 4, 5, 6, 1, 2, 3, 4, 2, 3, 1, 2, 3, 4, 5, 6, 1, 2