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 A050081 #4 Mar 30 2012 18:57:00 %S A050081 1,7,11,2,4,6,17,8,19,10,91,12,57,75,102,3,50,68,86,5,16,43,61,70,88, %T A050081 106,115,18,45,54,203,9,90,99,230,20,29,38,135,56,144,74,83,92,101, %U A050081 110,293,13,31,40,49,58,259,67,207,76,85,94,164 %N A050081 a(n)=position of n in A050080. %K A050081 nonn %O A050081 1,2 %A A050081 _Clark Kimberling_