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 A287013 #55 Nov 19 2020 04:37:00
%S A287013 2,5,8,6,8,3,4,5,3,0,9,3,6,4,7,1,9,0,1,4,9,8,8,4,7,4,4,1,6,9,1,9,4,3,
%T A287013 4,7,1,7,3,3,5,7,0,9,0,1,2,7,8,8,7,7,9,4,4,7,5,1,4,8,4,8,4,7,9,5,4,6,
%U A287013 2,0,6,0,2,5,4,9,7,0,0,8,3,6,8,2,2,7,3,7,3,3,8,7,8,8,1,4,3,1,5,3,2,7,1,6,1,0,9,0,6
%N A287013 Decimal expansion of Sum_{n>=0} 1/A000178(n).
%H A287013 Patrick C. Schneider, <a href="/A287013/b287013.txt">Table of n, a(n) for n = 1..10000</a>
%F A287013 Equals 1/A137987. - _Amiram Eldar_, Nov 19 2020
%e A287013 2.58683453093647190149884744169194347173357090127887794475148...
%t A287013 NSum[1/BarnesG[n], {n, 2, Infinity}, WorkingPrecision -> 115] // RealDigits // First (* _Jean-François Alcover_, Oct 27 2020 *)
%o A287013 (PARI) suminf(n=0, 1/prod(k=2, n, k!)) \\ _Michel Marcus_, Aug 01 2017
%Y A287013 Cf. A000178, A137987.
%K A287013 nonn,cons
%O A287013 1,1
%A A287013 _Miguel Alejandro Moreno Barrientos_, May 18 2017
%E A287013 More terms from _Michel Marcus_, Aug 01 2017