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 A214267 #11 Oct 16 2018 05:09:13 %S A214267 1,1,1,2,4,14,46,224,1024,6320,36976,275792,1965664,17180144, %T A214267 144361456,1446351104,13997185024,158116017920,1731678144256, %U A214267 21771730437632,266182076161024,3686171162253824,49763143319190016,752594181757712384,11118629668610842624 %N A214267 Duplicate of A005437. %K A214267 dead %O A214267 0,4 %A A214267 _Peter Luschny_, Jul 09 2012