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 A352615 #24 May 03 2022 23:51:12
%S A352615 2,0,7,7,6,8,1,4,6,0,0,2,8,1,5,8,2,0,5,7,8,3,1,2,0,5,5,6,7,8,5,5,2,9,
%T A352615 0,1,2,8,0,3,7,7,9,0,5,7,6,2,4,7,8,2,4,1,0,0,6,3,5,0,3,8,0,4,8,2,2,6,
%U A352615 3,5,5,3,1,4,6,3,2,0,3,8,4,6,3,3,0,1,6,0,0,0,0,9,6,9,2,1,9,0,7,5,2,3,4,0,5
%N A352615 Decimal expansion of Integral_{0<=x,y<=Pi/2} sqrt(1-cos^2(x)*cos^2(y)) dx dy.
%H A352615 Robert Ferréol, <a href="https://mathcurve.com/surfaces.gb/boheme/boheme.shtml">Bohemian dome</a>, Mathcurve.
%F A352615 Equals Sum _{n>=0} (Pi^2/(4*(2*n-1))*(binomial(2*n,n)/4^n)^3).
%F A352615 Equals (E(a) - K(a))^2 + E(a)^2 where a = 1/sqrt(2) and E (resp. K) is the complete elliptic integral of the second (resp. first) kind.
%e A352615 2.0776814600281582057831205567855290128037790576247...
%p A352615 a:=1/sqrt(2):evalf((EllipticE(a)-EllipticK(a))^2+EllipticE(a)^2,50);
%t A352615 RealDigits[(EllipticE[1/2] - EllipticK[1/2])^2 + EllipticE[1/2]^2, 10, 105][[1]] (* _Amiram Eldar_, Mar 24 2022 *)
%Y A352615 Cf. A091670 ((1/Pi^2)*Integral_{0<=x,y<=Pi} 1/sqrt(1-cos^2(x)*cos^2(y)) dx dy).
%K A352615 cons,nonn
%O A352615 1,1
%A A352615 _Robert FERREOL_, Mar 23 2022