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 A303939 #15 May 03 2018 08:52:02
%S A303939 1,1,2,2,4,5,8,10,14,18,25,32,43,54,71,88,114,141,180,221,278,340,423,
%T A303939 515,634,768,938,1131,1372,1646,1985,2371,2844,3383,4037,4783,5682,
%U A303939 6709,7936,9339,11004,12908,15155,17724,20740,24186,28214,32812,38165,44271,51354
%N A303939 Number of partitions of n into at most 2 copies of 1, 3 copies of 2, 4 copies of 3, ... .
%H A303939 Alois P. Heinz, <a href="/A303939/b303939.txt">Table of n, a(n) for n = 0..10000</a> (first 1001 terms from Seiichi Manyama)
%F A303939 G.f.: Product_{k>=1} (1-x^(k*(k+2)))/(1-x^k).
%e A303939 a(5) = 5 because we have [5], [4,1], [3,2], [3,1,1] and [2,2,1].
%Y A303939 Column k=2 of A303940.
%K A303939 nonn
%O A303939 0,3
%A A303939 _Seiichi Manyama_, May 03 2018