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 A119278 #6 Feb 16 2025 08:33:01 %S A119278 1,8,3,1,2,5,8,9,8,4,9,3,7,1,3,1,4,8,5,3,4,2,1,7,3,3,9,7,8,7,3,7,8,1, %T A119278 6,2,7,4,4,1,2,9,8,0,9,0,3,7,6,2,3,7,9,6,5,4,7,7,4,1,1,6,4,6,4,7,0,2, %U A119278 9,6,2,8,9,2,1,5,1,8,1,9,7,4,6,6,4,0,2,6,9,5,6,0,7,4,3,1,5,3,5,9,3,1,1,4,4 %N A119278 Decimal expansion of Feigenbaum c constant. %H A119278 Eric Weisstein's World of Mathematics, <a href="https://mathworld.wolfram.com/FeigenbaumConstant.html">Feigenbaum Constant</a> %e A119278 1.8312589849371314853... %Y A119278 Cf. A119277, A119279, A119280. %K A119278 nonn,cons %O A119278 1,2 %A A119278 _Eric W. Weisstein_, May 12 2006