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 A127110 #14 Aug 25 2022 16:30:09
%S A127110 1,1,2,20,220,11110,222200,20220200,2001022100,200102210000,
%T A127110 20211100210000,2210002222120000,1020101022210200000,
%U A127110 121001222020102200000,22100000121100001100000,11122000100002000202000000,2202002012101012102212000000,1201122101101102102110111000000
%N A127110 n! in base 3.
%t A127110 Table[FromDigits[IntegerDigits[n!,3]],{n,0,17}] (* _Stefano Spezia_, Aug 25 2022 *)
%o A127110 (PARI) a(n) = fromdigits(digits(n!, 3), 10); \\ _Michel Marcus_, Sep 04 2021
%Y A127110 Cf. A000142, A007089.
%Y A127110 Cf. A136754, A136690, A125552, A213857.
%K A127110 nonn
%O A127110 0,3
%A A127110 _Artur Jasinski_, Jan 05 2007