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 A023669 #3 Mar 30 2012 18:55:53 %S A023669 0,2,7,12,19,30,42,57,75,93,114,137,162,191,222,255,292,330,372,414, %T A023669 457,504,553,605,660,716,777,839,903,972,1041,1114,1190,1267,1347, %U A023669 1427,1510,1597,1684,1777,1870,1966,2065,2166,2271,2378,2486,2600 %N A023669 Convolution of A001950 and A014306. %K A023669 nonn %O A023669 1,2 %A A023669 _Clark Kimberling_