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 A023673 #3 Mar 30 2012 18:55:53 %S A023673 0,0,1,2,1,2,4,4,5,6,5,6,9,8,9,10,11,12,14,14,13,14,17,16,17,18,19,20, %T A023673 23,22,23,24,25,26,27,26,27,30,30,30,31,32,33,36,35,36,37,38,39,40,41, %U A023673 42,43,46,45,46,45,46,49,48,49,50,51,52,55,54,55,56,58,58,59 %N A023673 Convolution of A014306 with itself. %K A023673 nonn %O A023673 1,4 %A A023673 _Clark Kimberling_