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 A115027 #8 Feb 04 2020 04:53:47 %S A115027 1,2,14,58,174,402,838,1498,2566,4082,6214,8986,12790,17490 %N A115027 Duplicate of A114146. %K A115027 dead %O A115027 0,2