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 A050077 #4 Mar 30 2012 18:57:00 %S A050077 1,2,8,3,6,9,17,4,20,7,54,10,75,18,70,5,65,21,47,73,16,55,81,11,50,76, %T A050077 89,19,58,71,216,14,53,66,211,22,35,48,118,74,175,30,43,56,69,82,258, %U A050077 12,38,51,64,77,209,90,222,33,46,59,160,72,85 %N A050077 a(n)=position of n in A050076. %K A050077 nonn %O A050077 1,2 %A A050077 _Clark Kimberling_