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 A242943 #11 Apr 10 2025 23:21:34
%S A242943 8,0,8,6,5,2,5,1,8,3,5,0,2,1,2,2,4,4,9,1,5,4,2,1,9,2,9,4,0,9,6,8,0,3,
%T A242943 2,9,4,4,1,0,8,0,1,2,4,7,1,3,8,6,9,4,8,5,4,3,2,2,5,1,2,9,6,6,5,4,1,3,
%U A242943 2,3,3,2,7,9,2,6,9,5,3,9,1,2,7,4,5,5,1,6,0,4,9,1,0,4,7,7,8,9,1,8,7,2
%N A242943 Decimal expansion of the mean car density associated with Solomon's variation in Renyi's one-dimensional parking problem.
%D A242943 Steven R. Finch, Mathematical Constants, Cambridge University Press, 2003, Section 5.3 Renyi's parking constant, p. 279.
%H A242943 Eric Weisstein's MathWorld, <a href="https://mathworld.wolfram.com/RenyisParkingConstants.html">Rényi's Parking Constants</a>
%F A242943 Integral_{x>=0} (2*x+1)*exp(-2*(x+exp(-x)-1))*exp(-2*(-Ei(-x)+log(x)+gamma)) dx, where Ei is the exponential integral function and gamma the Euler-Mascheroni constant.
%e A242943 0.808652518350212244915421929409680329441...
%t A242943 digits = 102; NIntegrate[(2*x + 1)*Exp[-2*(x + Exp[-x] - 1)]*Exp[-2*(-ExpIntegralEi[-x] + Log[x] + EulerGamma)], {x, 0, Infinity}, WorkingPrecision -> digits + 5] // RealDigits[#, 10, digits] & // First
%Y A242943 Cf. A050996.
%K A242943 nonn,cons
%O A242943 0,1
%A A242943 _Jean-François Alcover_, May 27 2014