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 A197698 #12 Oct 01 2022 00:50:57
%S A197698 4,3,1,9,3,8,5,6,5,2,3,8,6,3,2,8,3,3,7,0,3,5,6,8,5,6,1,1,7,1,3,6,5,4,
%T A197698 9,7,0,2,4,0,1,3,2,0,0,1,1,7,8,4,6,7,7,3,7,1,0,9,2,4,0,3,0,7,8,8,2,5,
%U A197698 1,4,7,0,6,9,7,2,9,1,1,5,7,9,2,1,5,3,6,4,7,0,5,5,4,5,4,0,2,1,6
%N A197698 Decimal expansion of Pi^2/(4 + 6*Pi).
%C A197698 Least x > 0 such that sin(b*x) = cos(c*x) (and also sin(c*x) = cos(b*x)), where b=3 and c=2/Pi; see the Mathematica program for a graph and A197682 for a discussion and guide to related sequences.
%H A197698 <a href="/index/Tra#transcendental">Index entries for transcendental numbers</a>
%e A197698 0.43193856523863283370356856117136549702401320011...
%t A197698 b = 3; c = 2/Pi;
%t A197698 t = x /. FindRoot[Sin[b*x] == Cos[c*x], {x, .4, .5}]
%t A197698 N[Pi/(2*b + 2*c), 110]
%t A197698 RealDigits[%] (* A197698 *)
%t A197698 Simplify[Pi/(2*b + 2*c)]
%t A197698 Plot[{Sin[b*x], Cos[c*x]}, {x, 0, 2.5}]
%Y A197698 Cf. A197682.
%K A197698 nonn,cons
%O A197698 0,1
%A A197698 _Clark Kimberling_, Oct 17 2011