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 A043542 #12 Apr 24 2021 21:31:20
%S A043542 1,1,1,1,1,1,1,1,1,1,1,1,1,1,2,1,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,1,2,2,
%T A043542 2,2,2,2,2,2,2,2,2,2,2,2,2,1,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,1,2,2,2,2,
%U A043542 2,2,2,2,2,2,2,2,2,2,2,1,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,1,2,2,2,2,2,2,2,2,2
%N A043542 Number of distinct base-15 digits of n.
%H A043542 Antti Karttunen, <a href="/A043542/b043542.txt">Table of n, a(n) for n = 1..65536</a>
%t A043542 Table[Length[Union[IntegerDigits[n,15]]],{n,110}] (* _Harvey P. Dale_, Jul 14 2020 *)
%o A043542 (PARI) A043542(n) = #vecsort(digits(n, 15), , 8); \\ _Antti Karttunen_, Oct 08 2017
%Y A043542 Cf. A043289, A043567.
%K A043542 nonn,base
%O A043542 1,15
%A A043542 _Clark Kimberling_
%E A043542 More terms from _Antti Karttunen_, Oct 08 2017