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 A019646 #19 Sep 08 2022 08:44:44 %S A019646 1,4,6,1,1,4,1,1,8,2,6,6,1,1,3,8,9,3,2,2,7,0,8,1,1,5,3,8,0,5,3,8,4,1, %T A019646 1,5,7,6,9,8,9,5,3,7,7,6,3,2,3,2,8,3,4,2,9,5,0,8,8,7,0,0,0,5,7,3,5,9, %U A019646 7,8,0,8,6,1,8,1,4,7,8,4,4,2,2,2,1,9,7,8,2,8,3,8,8,3,5,2,9,4,6 %N A019646 Decimal expansion of sqrt(Pi*e)/2. %H A019646 Ivan Panchenko, <a href="/A019646/b019646.txt">Table of n, a(n) for n = 1..1000</a> %e A019646 1.4611411826611389322708115380538411576989537763232834295... %t A019646 RealDigits[Sqrt[Pi*E]/2, 10, 20][[1]] (* _G. C. Greubel_, Jan 10 2017 *) %o A019646 (PARI) sqrt(Pi*exp(1))/2 \\ _G. C. Greubel_, Jan 10 2017 %o A019646 (Magma) C<i> := ComplexField(); [Sqrt(Pi(C)*Exp(1))/2]; // _G. C. Greubel_, Nov 17 2017 %Y A019646 Cf. A019645. %K A019646 nonn,cons %O A019646 1,2 %A A019646 _N. J. A. Sloane_