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 A127988 #5 Jan 16 2013 07:48:37
%S A127988 0,8,32,40,128,136,160,168,512,520,544,552,640,648,672,680,2048,2056,
%T A127988 2080,2088,2176,2184,2208,2216,2560,2568,2592,2600,2688,2696,2720,
%U A127988 2728,8192,8200,8224,8232,8320,8328,8352,8360,8704,8712,8736
%N A127988 Sequence determining the parity of A025748.
%C A127988 Odd terms occur in A025748 at positions (0),1,2,3,(8),9,10,11,(32),33,34,35,(40),...
%F A127988 a(n)=8*A000695(n); a(n)=4*sum{k=0..floor(log_2(n+1)), mod(floor(n/2^k),2)2^(2k+1)};
%K A127988 easy,nonn
%O A127988 0,2
%A A127988 _Paul Barry_, Feb 09 2007