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 A043541 #11 Apr 24 2021 21:31:00
%S A043541 1,1,1,1,1,1,1,1,1,1,1,1,1,2,1,2,2,2,2,2,2,2,2,2,2,2,2,2,2,1,2,2,2,2,
%T A043541 2,2,2,2,2,2,2,2,2,2,1,2,2,2,2,2,2,2,2,2,2,2,2,2,2,1,2,2,2,2,2,2,2,2,
%U A043541 2,2,2,2,2,2,1,2,2,2,2,2,2,2,2,2,2,2,2,2,2,1
%N A043541 Number of distinct base-14 digits of n.
%H A043541 Vincenzo Librandi, <a href="/A043541/b043541.txt">Table of n, a(n) for n = 1..5000</a>
%t A043541 Table[Length[Select[DigitCount[n, 14], #>0&]], {n, 100}] (* _Vincenzo Librandi_, Aug 13 2017 *)
%o A043541 (PARI) a(n) = #Set(digits(n, 14)); \\ _Michel Marcus_, Aug 13 2017
%K A043541 nonn,base
%O A043541 1,14
%A A043541 _Clark Kimberling_