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 A278106 #7 Jan 18 2017 22:45:33 %S A278106 1,2,3,6,22,23,177,129,4954,58976,288436,238773 %N A278106 a(n) is the index of the first occurrence of n in A278102. %D A278106 R. B. Eggleton, J. S. Kimberley and J. A. MacDougall, Square-free rank of integers, submitted. %K A278106 nonn,hard,more %O A278106 1,2 %A A278106 _Jason Kimberley_, Nov 26 2016