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 A014775 #10 Jul 08 2025 05:41:44
%S A014775 1,-1,0,1,2,-6,-14,20,204,28,-2584,-6876,33760,219296,-121848,
%T A014775 -6020456,-15177904,126126960,950679424,-898745392,-38731873824,
%U A014775 -123922308896,1126028191520,10547325457536,-5093629711808
%N A014775 Expansion of exp ( - x - (1/2)*x^2 - (1/6)*x^3).
%t A014775 With[{nmax = 30}, CoefficientList[Series[Exp[-x - x^2/2 - x^3/6], {x, 0, nmax}], x] * Range[0, nmax]!] (* _Vaclav Kotesovec_, Feb 09 2020 *)
%Y A014775 Cf. A001464, A001680.
%K A014775 sign
%O A014775 0,5
%A A014775 _N. J. A. Sloane_