This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
%I A265337 #6 Dec 29 2015 03:10:23 %S A265337 0,1,1,2,1,3,2,2,1,2,2,3,2,3,3,3,1,3,2,3,2,4,3,4,2,2,3,4,3,5,4,3,1,4, %T A265337 4,3,2,5,4,4,2,3,2,3,3,6,2,5,2,4,3,4,3,5,4,4,3,2,3,2,4,5,3,4,1,5,3,3, %U A265337 2,3,3,4,2,3,5,4,3,4,4,4,2,3,3,4,3,5,6,4,2,5,4,5,4,6,5,5,2,3,4,5,3,5,3,7,3,6,4,6,4,4,4,5,3,3,5,4,5,5,5,6,4,5,4,4,3,5,4,5,4 %N A265337 Number of 1-bits in base-3 reversal of n: a(n) = A000120(A263273(n)). %H A265337 Antti Karttunen, <a href="/A265337/b265337.txt">Table of n, a(n) for n = 0..16384</a> %F A265337 a(n) = A000120(A263273(n)). %F A265337 a(0) = 0, a(2n) = a(A265339(n)), a(2n+1) = 1 + a(A265339(n)). %F A265337 a(n) = A265340(n) - A265336(n). %o A265337 (Scheme) (definec (A265337 n) (if (zero? n) 0 (+ (A265337 (A265339 n)) (if (odd? n) 1 0)))) %Y A265337 Cf. A000120, A263273, A265336, A265339, A265340. %K A265337 nonn,base %O A265337 0,4 %A A265337 _Antti Karttunen_, Dec 18 2015