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 A307126 #9 Apr 03 2019 09:03:46
%S A307126 0,1,0,-2,5,3,-88,362,534,-17363,103354,175690,-9218328,80446715,
%T A307126 46936658,-10553663682,136009808336,-210505566343,-22766371152222,
%U A307126 418488315816586,-1679396876267976,-82907733267235305,2070045795782097506,-13611715282931011890,-463120892871268874832
%N A307126 Expansion of e.g.f. log(1 + log(1 + x*exp(x))).
%p A307126 a:=series(log(1+log(1+x*exp(x))),x=0,25): seq(n!*coeff(a,x,n),n=0..24); # _Paolo P. Lava_, Apr 03 2019
%t A307126 nmax = 24; CoefficientList[Series[Log[1 + Log[1 + x Exp[x]]], {x, 0, nmax}], x] Range[0, nmax]!
%o A307126 (PARI) my(x = 'x + O('x^30)); Vec(serlaplace(log(1 + log(1 + x*exp(x))))) \\ _Michel Marcus_, Mar 26 2019
%Y A307126 Cf. A003713, A007550, A009306, A307125.
%K A307126 sign
%O A307126 0,4
%A A307126 _Ilya Gutkovskiy_, Mar 26 2019