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 A091556 #12 Sep 08 2022 08:45:13
%S A091556 2,3,6,5,2,7,2,1,1,8,6,2,5,4,4,1,5,5,1,8,7,7,2,1,9,3,2,8,4,5,6,5,2,2,
%T A091556 0,1,6,1,8,8,3,1,6,0,7,1,7,6,5,1,1,1,0,5,8,6,9,9,7,6,7,6,9,4,9,5,1,0,
%U A091556 3,4,3,7,5,4,2,1,0,2,8,8,0,0,0,7,0,1,2,1,9,5,5,5,9,0,7,5,9,7,1,2
%N A091556 Decimal expansion of 1/(1-Gamma).
%H A091556 G. C. Greubel, <a href="/A091556/b091556.txt">Table of n, a(n) for n = 1..10000</a>
%F A091556 Sum_{i>=0} gamma^i.
%e A091556 2.3652721186254415518772193284565220161883160717651110586997676949510...
%t A091556 RealDigits[1/(1-EulerGamma),10,120][[1]] (* _Harvey P. Dale_, Feb 21 2013 *)
%o A091556 (PARI) 1/(1-Euler)
%o A091556 (Magma) R:= RealField(100); 1/(1 - EulerGamma(R)); // _G. C. Greubel_, Sep 05 2018
%Y A091556 Cf. A001620.
%K A091556 nonn,cons
%O A091556 1,1
%A A091556 _Jon Perry_, Mar 04 2004