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 A023666 #3 Mar 30 2012 18:55:53 %S A023666 0,1,4,7,11,18,25,34,45,56,69,83,98,116,135,155,178,201,227,253,279, %T A023666 308,338,370,404,438,476,514,553,596,638,683,730,777,827,876,927,981, %U A023666 1034,1092,1149,1208,1269,1331,1396,1462,1528,1599,1669,1741 %N A023666 Convolution of A000201 and A014306. %K A023666 nonn %O A023666 1,3 %A A023666 _Clark Kimberling_