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 A257176 #16 Jul 01 2023 14:34:20
%S A257176 1,1,9,9,0,5,8,7,1,0,0,0,2,8,2,3,6,2,9,7,1,9,3,2,9,4,3,0,9,6,6,2,5,8,
%T A257176 3,0,5,2,2,2,9,0,6,5,1,6,7,7,0,9,5,8,5,2,0,0,2,2,2,4,3,4,6,2,2,4,3,6,
%U A257176 8,6,9,8,3,7,6,3,0,4,3,0,9,0,2,0,0,4,9,4,4,0,0,9,7,2,1,1,8,7,7,4,5,4,8,4,1
%N A257176 Decimal expansion of Integral_{x=0..1} Integral_{y=0..x} sin(x*y) dy dx.
%C A257176 One of the examples in Mathematica's help file under "Integrate".
%F A257176 Equals (A001620 - A099282)/2.
%e A257176 0.1199058710002823629719329430966258305222906516770958520022243462243686983763...
%t A257176 RealDigits[Integrate[Sin[x y], {x, 0, 1}, {y, 0, x}], 10, 111][[1]]
%Y A257176 Cf. A001620, A099282.
%K A257176 nonn,cons,easy
%O A257176 0,3
%A A257176 _Robert G. Wilson v_, Apr 17 2015