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 A377202 #12 Oct 20 2024 17:57:54
%S A377202 5,5,4,1,2,6,4,2,3,9,7,9,5,7,1,9,8,7,1,2,3,0,7,8,8,3,4,5,3,7,9,0,2,7,
%T A377202 1,8,9,2,2,9,4,9,5,7,9,3,9,6,0,5,6,4,6,9,2,4,0,4,7,3,1,9,8,7,3,8,3,1,
%U A377202 0,8,4,7,1,0,7,1,3,4,1,7,9,4,6,3,8,1,5,4,5,5
%N A377202 Decimal expansion of Integral_{x=0..oo} exp(-x)*erf(sqrt(x))^2 dx, where erf is the error function.
%H A377202 Paolo Xausa, <a href="/A377202/b377202.txt">Table of n, a(n) for n = 0..10000</a>
%H A377202 Eric Weisstein's World of Mathematics, <a href="https://mathworld.wolfram.com/Erf.html">Erf</a>.
%H A377202 Wikipedia, <a href="https://en.wikipedia.org/wiki/Error_function">Error function</a>.
%F A377202 Equals 2*sqrt(2)*arccot(sqrt(2))/Pi = A010466*A195695/A000796 (cf. eq. 37 in Weisstein link).
%e A377202 0.554126423979571987123078834537902718922949579396...
%t A377202 First[RealDigits[Sqrt[8]*ArcCot[Sqrt[2]]/Pi, 10, 100]]
%Y A377202 Cf. A000796, A010466, A195695, A377203.
%K A377202 nonn,cons
%O A377202 0,1
%A A377202 _Paolo Xausa_, Oct 19 2024