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 A290269 #13 Oct 07 2017 03:21:32
%S A290269 1,1,3,5,6,10,18,25,34,53,66,94,136,179,236,325,416,550,714,913,1181,
%T A290269 1530,1917,2446,3091,3862,4828,6051,7457,9233,11465,14028,17181,21099,
%U A290269 25651,31251,37948,45853,55380,66833,80236,96271,115496,137822,164470,196094,232837
%N A290269 G.f.: Product_{m>0} (1 + x^m + 2*x^(2*m) + 3*x^(3*m)).
%H A290269 Seiichi Manyama, <a href="/A290269/b290269.txt">Table of n, a(n) for n = 0..500</a>
%o A290269 (PARI) m = 30; Vec(prod(k=1, m, 1 + x^k + 2*x^(2*k) + 3*x^(3*k)) + O(x^m)) \\ _Michel Marcus_, Oct 07 2017
%Y A290269 Column k=3 of A290216.
%K A290269 nonn
%O A290269 0,3
%A A290269 _Seiichi Manyama_, Oct 06 2017