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 A116142 #19 Nov 05 2018 12:09:47 %S A116142 82,8242,9802,538277,998002,77837026,99980002,7922547265,8643251345, %T A116142 9223797610,9999800002,106710893290,453378226757,491023832065, %U A116142 945958034530,999998000002,11916002265170,15790977390245 %N A116142 Duplicate of A054214. %K A116142 dead %O A116142 1,1