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 A061056 #21 Apr 08 2022 15:58:47 %S A061056 1,2,3,6,12,30,72,210,630,1920,6336,22176,78975,295680,1144000,4576000 %N A061056 Duplicate of A060777. %K A061056 dead %O A061056 1,2 %A A061056 _Ed Pegg Jr_, May 28 2001