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 A050995 #13 Feb 16 2025 08:32:41
%S A050995 1,1,2,9,144,1800,64800,39690,12700800,171460800,17146080000,
%T A050995 518668920000,2390026383360,3606379096320000,449813829104640000,
%U A050995 139161153379248000000,4453156908135936000000
%N A050995 Reduced denominators of series expansion for integrand in Renyi's parking constant.
%H A050995 Eric Weisstein's World of Mathematics, <a href="https://mathworld.wolfram.com/RenyisParkingConstants.html">Renyi's Parking Constants.</a>
%t A050995 nmax = 20; Denominator[CoefficientList[Series[Exp[-2*EulerGamma+2*ExpIntegralEi[-x]]/x^2, {x, 0, nmax}], x]] (* _Vaclav Kotesovec_, Aug 12 2019 *)
%Y A050995 Cf. A050994, A050996.
%K A050995 nonn,frac
%O A050995 0,3
%A A050995 _Eric W. Weisstein_