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 A173273 #45 Jul 10 2021 06:44:59
%S A173273 6,2,4,2,8,0,7,1,5,0,7,5,8,6,5,7,5,9,5,0,2,9,6,4,1,3,1,8,9,1,4,5,3,5,
%T A173273 3,9,8,8,8,1,9,3,8,1,0,1,9,9,7,2,2,4,2,7,6,5,5,9,9,0,6,3,1,8,2,1,0,4,
%U A173273 5,5,3,6,8,7,0,6,7,9,5,7,2,5,9,3,4,0,6,6,9,1,1,3,3,7,8,5,0,0,6,1,9,2,3,1,5
%N A173273 Decimal expansion of 1 - 2*A037077.
%e A173273 0.624280715...
%t A173273 digits = 105; 1-2*NSum[ (-1)^n*((n^(1/n)) - 1), {n, 1, Infinity}, WorkingPrecision -> digits+10, Method -> "AlternatingSigns"] // RealDigits[#, 10, digits]& // First (* _Jean-François Alcover_, Feb 15 2013 *)
%Y A173273 Cf. A037077.
%K A173273 nonn,cons
%O A173273 0,1
%A A173273 _Marvin Ray Burns_, Feb 14 2010, Feb 24 2010, Mar 05 2010