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 A248761 #14 Oct 19 2014 15:52:04
%S A248761 2,4,6,9,5,0,6,3,1,4,5,2,1,0,4,7,5,6,2,4,7,5,6,3,6,7,4,4,6,6,0,1,5,0,
%T A248761 2,5,7,6,8,9,7,5,6,1,8,3,9,9,4,9,6,9,1,9,9,6,7,7,9,2,5,7,0,1,9,7,1,8,
%U A248761 3,5,4,8,8,0,0,3,4,0,8,8,3,4,0,3,8,6,6,2,5,0,8,4,1,2,0,0,7,1,3,5,1,7,2,6,1
%N A248761 Decimal expansion of sum_{n >= 1} 1/sqrt(n!).
%e A248761 2.46950631452104756247563674466015025768975618399496919967792570...
%p A248761 evalf(sum(1/sqrt(n!), n=1..infinity), 120); # _Vaclav Kotesovec_, Oct 19 2014
%t A248761 u = N[Sum[1/Sqrt[n!], {n, 1, 200}], 100]
%t A248761 RealDigits[u] (* A248761 *)
%o A248761 (PARI) suminf(n=1, (1/sqrt(n!))) \\ _Michel Marcus_, Oct 18 2014
%Y A248761 Cf. A214869, A248696, A248759, A248760.
%K A248761 nonn,easy,cons
%O A248761 1,1
%A A248761 _Clark Kimberling_, Oct 13 2014