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 A054075 #5 Mar 30 2012 18:57:01 %S A054075 1,3,4,9,11,19,28,31,43,47,62,78,83,102,108,130,137,162,188,196,225, %T A054075 234,266,299,309,345,356,395,407,449,492,505,551,565,614,664,679,732, %U A054075 748,804,861,878,938,956,1019,1038,1104,1171,1191 %N A054075 Position of first appearance of n in A054073. %K A054075 nonn %O A054075 1,2 %A A054075 _Clark Kimberling_