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 A294471 #11 Jul 30 2021 14:56:35
%S A294471 1,-1,0,-6,18,-90,660,-3360,47880,-293160,4277280,-36424080,575190000,
%T A294471 -6745218480,101911249440,-1628086299840,24861230634240,
%U A294471 -484979925830400,7629427896330240,-176975913961566720,3036472694482106880,-77953392499390087680
%N A294471 E.g.f.: 1/Product_{k>0} (1+x^k/k)^k.
%H A294471 Seiichi Manyama, <a href="/A294471/b294471.txt">Table of n, a(n) for n = 0..449</a>
%t A294471 With[{nn=30},CoefficientList[Series[1/Product[(1+x^k/k)^k,{k,nn}],{x,0,nn}],x] Range[0,nn]!] (* _Harvey P. Dale_, Jul 30 2021 *)
%o A294471 (PARI) N=66; x='x+O('x^N); Vec(serlaplace(1/prod(k=1, N, (1+x^k/k)^k)))
%Y A294471 Cf. A292358.
%Y A294471 Cf. A181541, A294469, A294470.
%K A294471 sign
%O A294471 0,4
%A A294471 _Seiichi Manyama_, Oct 31 2017