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 A104338 #17 Aug 23 2018 02:16:36 %S A104338 1,1,1,0,1,0,1,0,0,1,1,1,1,1,0,0,1,0,1,1,1,0,0,0,1,0,0,1,1,1,1,1,0,1, %T A104338 0,0,0,0,0,0,1,0,0,1,1,0,1,0,1,1,1,0,1,0,0,0,0,1,0,0,0,1,0,1,0,0,1,0, %U A104338 0,0,0,1,0,1,0,1,1,0,0,0,0,0,1,0,0,0,1,0,1,1,1,0,0,0,1,1,0,1,1,1,1,1,0,1,0 %N A104338 Binary expansion of Catalan constant A006752. %H A104338 G. C. Greubel, <a href="/A104338/b104338.txt">Table of n, a(n) for n = 0..10000</a> %e A104338 In base 10: 0.91596559..., in base 2: 0.1110101001111... %t A104338 RealDigits[Catalan, 2, 200] (* _Stefan Steinerberger_, Sep 17 2007 *) %Y A104338 Cf. A006752, A113860. %Y A104338 Cf. A006752, A014538, A153069, A153070, A054543, A118323. - _Stuart Clary_, Dec 17 2008 %K A104338 nonn,cons,base %O A104338 0,1 %A A104338 _N. J. A. Sloane_, Sep 16 2007 %E A104338 More terms from _Stefan Steinerberger_, Sep 17 2007