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 A181919 #12 Apr 02 2012 20:10:13 %S A181919 3,6,7,9,7,0,3,8,4,9,8,0,3,2,9,4,7,3,0,2,7,1,7,2,8,9,8,8,1,5,7,7,3,5, %T A181919 7,8,2,1,1,6,7,5,6,9,1,5,0,3,3,2,5,1,5,9,3,9,6,9,6,3,4,9,5,7,8,3,3,0, %U A181919 7,5,2,8,5,7,4,5,0,9,8,2,6,2,4,8,2,1,0,6,9,0,5,1,7,2,2,2,4,0,3,8 %N A181919 The value of r at the bifurcation point of the first period-13 cycle of the logistic map f(x) = r*x*(1 - x). %C A181919 Root of a degree 4095*2 = 8190 polynomial. %H A181919 Cheng Zhang, <a href="/A181919/a181919.txt">the polynomial of T = r*(r-2)</a> %e A181919 3.6797038498... %Y A181919 Cf. A086178, A086179, A086180, A086181, A091517, A118452, A181906, A181907, A181909, A181910, A181911, A181912, A181913, A181915, A181916, A181917, A181918. %K A181919 nonn,cons %O A181919 1,1 %A A181919 _Cheng Zhang_, Apr 01 2012