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 A151334 #28 Feb 24 2016 07:59:12 %S A151334 1,1,5,42,462,6006,87516,1385670,23371634,414315330,7646001090, %T A151334 145862174640,2861142656400,57468093927120 %N A151334 Duplicate of A005789. %K A151334 dead %O A151334 0,3