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 A134881 #10 Dec 02 2018 02:22:42
%S A134881 0,6,5,9,8,8,4,1,7,7,4,3,3,4,3,7,9,1,7,5,6,5,6,2,3,8,6,7,2,4,1,0,7,7,
%T A134881 9,7,4,3,8,1,4,4,4,3,9,3,4,1,2,1,3,1,0,2,6,2,8,0,5,4,3,6,6,5,5,9,9,9,
%U A134881 8,5,2,0,7,6,6,0,7,1,5,7,1,2,7,8,5,1,1,2,0,0,8,1,9,4,3,6,0,7,7,0,2
%N A134881 Decimal expansion of Sum_{k>=1} 1/(e^k)^(e^k).
%e A134881 0.06598841774334379175656238672410779743814443934121...
%t A134881 RealDigits[N[Sum[1/(E^n)^(E^n), {n, 1, 20}], 200]][[1]] (* first two zeros removed *)
%Y A134881 Cf. A073009, A100085, A134877, A134878, A134879, A134890.
%K A134881 nonn,cons
%O A134881 0,2
%A A134881 _Artur Jasinski_, Nov 14 2007