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 A085551 #12 Jan 24 2020 09:44:04
%S A085551 1,9,2,5,8,2,4,0,3,5,6,7,2,5,2,0,1,5,6,2,5,3,5,5,2,4,5,7,7,0,1,6,4,7,
%T A085551 7,8,1,4,7,5,6,0,0,8,0,8,2,2,3,9,4,4,1,8,8,4,0,1,9,4,3,3,5,0,0,8,3,2,
%U A085551 2,9,8,1,4,1,3,8,2,9,3,4,6,4,3,8,3,1,6,8,9,0,8,3,9,9,1,7,7,4,2,2,0,9,3,5,2
%N A085551 Decimal expansion of (sqrt(29)-5)/2.
%H A085551 Daniel Starodubtsev, <a href="/A085551/b085551.txt">Table of n, a(n) for n = 0..10000</a>
%F A085551 Equals Sum_{n>=1}(-1)^(n-1)/(A052918(n)*A052918(n+1)). - _Vladimir Shevelev_, Feb 23 2013
%e A085551 0.19258240356725201562535524577...
%o A085551 (PARI) (sqrt(29)-5)/2 \\ _Michel Marcus_, Jan 16 2020
%Y A085551 Cf. A010484 (sqrt(29)), A052918.
%K A085551 easy,cons,nonn
%O A085551 0,2
%A A085551 _Cino Hilliard_, Jul 04 2003