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 A356983 #19 Oct 05 2022 05:07:26
%S A356983 6,5,3,0,7,2,9,4,9,8,9,4,9,1,2,1,3,1,3,8,9,5,3,1,8,8,1,1,1,7,2,2,5,4,
%T A356983 3,1,5,6,7,6,0,0,1,4,5,3,6,8,3,6,9,1,1,6,9,4,6,7,9,7,8,2,7,5,5,1,9,2,
%U A356983 2,5,8,5,7,6,0,9,0,8,5,2,2,3,4,3,7,7,3,8,5,3,9,5,3,1,8,2,4
%N A356983 Decimal expansion of Pi * e^(-Pi/2).
%H A356983 Michael Penn, <a href="https://www.youtube.com/watch?v=MLKMJs4JvpE">This integral looks crazy</a>, YouTube video, 2022.
%F A356983 Equals Integral_{x=0..Pi} i^tan(x) dx, where i is the imaginary unit.
%e A356983 0.653072949894912131389531881117225431...
%t A356983 RealDigits[Pi * Exp[-Pi/2], 10, 100][[1]]
%o A356983 (PARI) Pi * exp(-Pi/2)
%Y A356983 Cf. A000796, A001113, A049006.
%K A356983 nonn,cons
%O A356983 0,1
%A A356983 _Christoph B. Kassir_, Sep 07 2022