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 A290395 #13 Oct 07 2017 03:21:29
%S A290395 1,-1,-2,0,5,1,-12,-3,31,13,-64,-57,139,164,-285,-458,560,1217,-950,
%T A290395 -3176,1396,7786,-1129,-18607,-2378,43043,17680,-96655,-67957,208061,
%U A290395 217269,-429510,-628868,836424,1710935,-1497065,-4434111,2294633,11061661,-2348910
%N A290395 G.f.: Product_{m>0} 1/(1 + x^m + 2*x^(2*m) + 3*x^(3*m)).
%H A290395 Seiichi Manyama, <a href="/A290395/b290395.txt">Table of n, a(n) for n = 0..500</a>
%o A290395 (PARI) m = 30; Vec(prod(k=1, m, 1/(1 + x^k + 2*x^(2*k) + 3*x^(3*k))) + O(x^m)) \\ _Michel Marcus_, Oct 07 2017
%Y A290395 Column k=3 of A290217.
%K A290395 sign
%O A290395 0,3
%A A290395 _Seiichi Manyama_, Oct 06 2017