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 A294494 #12 May 12 2018 14:42:16
%S A294494 1,-1,0,-3,26,-75,324,-3535,30988,-242025,2245820,-26847381,339741984,
%T A294494 -4205748547,57094691822,-883946426805,14358210544304,
%U A294494 -239959114870689,4286519116236900,-82194727064059645,1650577120959962440,-34495065863164195611
%N A294494 E.g.f.: 1/Product_{k>0} (1+x^k/k!)^k.
%H A294494 Seiichi Manyama, <a href="/A294494/b294494.txt">Table of n, a(n) for n = 0..449</a>
%t A294494 With[{nn=30},CoefficientList[Series[1/Product[(1+x^k/k!)^k,{k,nn}],{x,0,nn}],x] Range[0,nn]!] (* _Harvey P. Dale_, May 12 2018 *)
%o A294494 (PARI) N=66; x='x+O('x^N); Vec(serlaplace(1/prod(k=1, N, (1+x^k/k!)^k)))
%Y A294494 Cf. A292308.
%Y A294494 Cf. A032315, A174661, A294495.
%K A294494 sign
%O A294494 0,4
%A A294494 _Seiichi Manyama_, Nov 01 2017