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 A333540 #7 Jul 09 2025 04:51:49 %S A333540 1,2,16,23752 %N A333540 A333539(n)/n!. %D A333540 N. J. A. Sloane, Cutting Up a Cube, Math Fun Mailing List, Apr 10 2020; with replies from _Tom Karzes_, _Tomas Rokicki_, _Veit Elser_, and others. %Y A333540 Cf. A007847, A333539. %K A333540 nonn,more %O A333540 1,2 %A A333540 _N. J. A. Sloane_, Apr 14 2020, following a suggestion from _Veit Elser_