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 A130254 #10 Feb 23 2017 23:34:53 %S A130254 0,1,4,7,11,15,20,25,30,35,40,45,51,57,63,69,75,81,87,93,99,105,112, %T A130254 119,126,133,140,147,154,161,168,175,182,189,196,203,210,217,224,231, %U A130254 238,245,252,259,267,275,283,291,299,307,315,323,331,339,347,355,363,371 %N A130254 Duplicate of A130252. %K A130254 dead %O A130254 0,3