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 A101419 #4 Jul 05 2015 19:48:47 %S A101419 4,0,0,0,9,0,0,6,6,5,3,5,2,9,9,1,0,0,4,8,0,9,6,2,6,0,2,4,2,2,0,2,4,9, %T A101419 5,7,7,5,9,5,3,0,3,2,2,0,8,2,7,9,0,8,8,0,0,9,4,0,5,3,9,9,7,6,8,9,4,8, %U A101419 6,9,2,0,5,9,3,9,7,2,4,6,9,6,2,5,4,7,7,8,9,6,4,0,4,4,3,9,7,0,3,0,8,0,7,7,5 %N A101419 Decimal expansion of d - log(d-e) where d is Feigenbaum's bifurcation velocity constant (A006890, delta constant) and e is Euler's constant. %C A101419 From Plouffe's Inverter: log(s)^2 * a^2 * sin(1)^1 = 4.000900694855076... where s is Sierpinski's constant (A062089) and a is Feigenbaum's reduction parameter (A006891, alpha constant). 20 + Pi - exp(Pi) = .00090002081... %e A101419 4.00090066535299100480962602422024957759530322082790880094053997689... %Y A101419 Cf. A006890, A006891, A001113, A062089. %K A101419 cons,nonn %O A101419 1,1 %A A101419 _Gerald McGarvey_, Jan 16 2005