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 A135707 #5 Sep 21 2017 09:03:22
%S A135707 1,0,8,8,1,3,8,2,4,9,8,6,1,2,5,4,0,2,6,0,1,3,3,8,0,0,3,9,8,8,2,2,1,8,
%T A135707 7,6,1,5,9,3,7,0,3,3,1,8,6,5,9,4,4,8,3,2,3,5,3,7,1,7,3,2,4,9,8,8,8,0,
%U A135707 3,9,0,4,3,0,3,7,2,8,9,9,3,7,9,8,5,0,2,0,0,8,5,7,3,6,6,0,1,2,0
%N A135707 Consider a domino formed from two adjacent 1 X 1 squares. This is the decimal expansion of the average distance between a random point in the left square and a random point in the right square.
%F A135707 (116 - 8 Sqrt[2] - 20 Sqrt[5] + 140 ArcCsch[2] - 40 ArcSinh[1] + 80 ArcSinh[2] + Log[32] + 10 Log[-1 + Sqrt[5]] - 15 Log[123 + 55 Sqrt[5]]) / 120
%e A135707 1.0881382498612540260133800398822187615937033186594483235371...
%t A135707 d[x1_,y1_,x2_,y2_] := Sqrt[ (x1-x2)^2+(y1-y2)^2 ]
%t A135707 Integrate[ d[x1,y1,x2,y2], {x1,-1,0},{x2,0,1},{y1,0,1},{y2,0,1} ]
%K A135707 nonn,cons
%O A135707 1,3
%A A135707 Richard C. Schroeppel and _Michael Kleber_, Mar 05 2008