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 A019633 #29 Sep 08 2022 08:44:44
%S A019633 4,1,3,2,7,3,1,3,5,4,1,2,2,4,9,2,9,3,8,4,6,9,3,9,1,8,8,4,2,9,9,8,5,2,
%T A019633 6,4,9,4,4,5,5,2,1,9,1,6,9,9,1,3,0,8,4,5,1,5,5,6,6,5,1,2,5,3,7,9,7,9,
%U A019633 5,7,9,2,8,5,1,3,4,1,7,0,3,2,3,6,2,5,2,0,3,6,2,4,5,5,4,6,6,2,8
%N A019633 Decimal expansion of sqrt(2*Pi*e).
%D A019633 Steven R. Finch, Mathematical Constants, Cambridge University Press, 2003, p. 220.
%H A019633 G. C. Greubel, <a href="/A019633/b019633.txt">Table of n, a(n) for n = 1..10000</a> (terms 1..1000 from Ivan Panchenko)
%F A019633 Equals 2*A059444. - _Michel Marcus_, May 13 2014
%F A019633 Equals Integral_{x>=0} exp(-log(x)^2/2) dx. - _Amiram Eldar_, Apr 07 2021
%t A019633 RealDigits[Sqrt[2Pi E],10,120][[1]] (* _Harvey P. Dale_, Apr 16 2013 *)
%o A019633 (PARI) sqrt(2*Pi*exp(1)) \\ _Charles R Greathouse IV_, May 14 2014
%o A019633 (Magma) C<i> := ComplexField(); Sqrt(2*Pi(C)*Exp(1)); // _G. C. Greubel_, Jan 28 2018
%Y A019633 Cf. A059444.
%K A019633 nonn,cons
%O A019633 1,1
%A A019633 _N. J. A. Sloane_, Dec 11 1996