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 A135587 #8 Aug 08 2015 23:49:22 %S A135587 1,2,5,3,7,8,17,4,9,10,21,11,23,24,49,5,11,12,25,13,27,28,57,14,29,30, %T A135587 61,31,63,64,129,6,13,14,29,15,31,32,65,16,33,34,69,35,71,72,145,17, %U A135587 35,36,73,37,75,76,153,38,77,78,157,79,159,160,321,7,15,16,33,17,35,36,73 %N A135587 a(n) = A135586(2n). %H A135587 R. Zumkeller, <a href="/A135587/b135587.txt">Table of n, a(n) for n = 1..5000</a> %F A135587 a(2^k) = k+1; a(4*k+2) = a(4*k+1) + 1; a(4*k+3) = 2*a(4*k+2) + 1. - _Reinhard Zumkeller_, Mar 02 2008 %Y A135587 Cf. A135586. %K A135587 nonn,easy,look %O A135587 1,2 %A A135587 _Don Knuth_, Mar 01 2008 %E A135587 More terms from _Reinhard Zumkeller_, Mar 02 2008