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 A293533 #16 Oct 13 2017 05:27:25
%S A293533 1,-1,-1,5,-23,-41,1111,-6259,-16015,828143,-6453809,-23557931,
%T A293533 1516982809,-15821700025,-76745280793,5613303472349,-73951449390239,
%U A293533 -445513157340449,36776986711862815,-582726291386478427,-4158268555818657079,388618610293537423799
%N A293533 E.g.f.: 1/Product_{m > 0, m mod 3 > 0} exp(x^m).
%F A293533 E.g.f.: exp((x + x^2)/(x^3 - 1)).
%t A293533 CoefficientList[Series[E^(x*(1 + x)/(x^3 - 1)), {x, 0, 20}], x] * Range[0, 20]! (* _Vaclav Kotesovec_, Oct 12 2017 *)
%o A293533 (PARI) N=66; x='x+O('x^N); Vec(serlaplace(exp((x+x^2)/(x^3-1))))
%o A293533 (PARI) N=66; x='x+O('x^N); Vec(serlaplace(prod(m=1, N, exp(x^(3*m))/exp(x^m))))
%Y A293533 Column k=3 of A293530.
%K A293533 sign
%O A293533 0,4
%A A293533 _Seiichi Manyama_, Oct 11 2017