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 A141719 #2 Mar 30 2012 18:51:59 %S A141719 4,8,8,12,15,12,16,24,21,16,20,35,32,27,20,24,48,45,40,33,24,28,63,60, %T A141719 55,48,39,28,32,80,77,72,65,56,45,32,36,99,96,91,84,75,64,51,36,40, %U A141719 120,117,112,105,96,85,72,57,40,44 %N A141719 Triangle online: 4, A140978(n+1) - A133819 . %C A141719 4 is A140978(0). %F A141719 Triangle: 4; 8, 8; 12, 15, 12; 16, 24, 21, 16; 20, 35, 32, 27, 20; . %K A141719 nonn,uned %O A141719 1,1 %A A141719 _Paul Curtz_, Sep 11 2008