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 A161257 #6 Jul 22 2025 06:35:27 %S A161257 0,0,0,1,1,1,1,2,1,2,1,3,2,4,3,6,4,6,5,9,7,9,8,13,10,13,11,19,14,19, %T A161257 16,26,21,28,25,36,29,39,34,49,41,55,48,66,56,71,65,86,78,94,87,111, %U A161257 99,121,113,143,128,155,146,180,165,196,189,226,211,246,237,281,267,310,300,351,334 %N A161257 Number of partitions of n into central polygonal numbers A000124 where every part appears at least 4 times. %H A161257 R. H. Hardin, <a href="/A161257/b161257.txt">Table of n, a(n) for n=1..1000</a> %K A161257 nonn %O A161257 1,8 %A A161257 _R. H. Hardin_ Jun 06 2009