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 A062744 #29 Feb 06 2020 22:41:06 %S A062744 1,1,10,145,2470,46060,910252,18730855,397089550,8612835715, %T A062744 190223180840,4263421511271,96723482198980,2216905597676000, %U A062744 51256802757808320 %N A062744 Duplicate of A059968. %K A062744 dead %O A062744 0,3