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 A193424 #50 Feb 06 2019 02:27:14
%S A193424 1,5,5,8,6,7,0,4,3,6,4,2,5,3,8,9,0,4,2,8,1,0,2,2,3,9,8,3,4,7,0,8,5,9,
%T A193424 3,3,3,3,9,5,6,9,2,7,9,5,5,6,1,4,8,3,9,1,4,5,4,4,3,9,7,4,0,3,5,2,2,2,
%U A193424 0,0,6,7,6,2,2,7,1,8,3,6,6,8,7,8,9,0,2,9,3,3,2,4,6,8,6,5,4,4,1,5,7,0,8,1,3
%N A193424 Decimal expansion of Sum_{n>=1} log(n+1)/n!.
%C A193424 Equal to log(2*exp(1/2*log(3*exp(1/3*log(4*exp(...)))))). - _Rok Cestnik_, Jan 31 2019
%e A193424 1.55867043642538904...
%t A193424 NSum[ Log[n + 1]/n!, {n, 1, Infinity}, WorkingPrecision -> 110, NSumTerms -> 100] // RealDigits[#, 10, 105]& // First (* _Jean-François Alcover_, Feb 20 2013 *)
%o A193424 (PARI) suminf(n=1, log(n+1)/n!) \\ _Michel Marcus_, Jan 31 2019
%Y A193424 Cf. A306243.
%K A193424 nonn,cons
%O A193424 1,2
%A A193424 _N. J. A. Sloane_, Aug 23 2011, based on a posting by Richard C. Schroeppel to the Math Fun Mailing List
%E A193424 More terms from _Alois P. Heinz_, Aug 28 2011