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 A044961 #7 Aug 13 2012 11:01:36
%S A044961 1,2,3,4,5,6,7,8,9,10,11,13,26,39,52,65,78,91,104,117,130,143,144,145,
%T A044961 156,157,158,159,160,161,162,163,164,165,166,167,169,170,181,183,193,
%U A044961 196,205,209,217,222,229,235,241,248,253,261
%N A044961 Numbers with no two equally numerous base 12 digits.
%H A044961 Harvey P. Dale, <a href="/A044961/b044961.txt">Table of n, a(n) for n = 1..1000</a>
%t A044961 nb12Q[n_]:=Module[{c=Select[DigitCount[n,12],#>0&]},Length[c] == Length[ Union[c]]]; Select[Range[300],nb12Q] (* _Harvey P. Dale_, Aug 13 2012 *)
%K A044961 nonn,base
%O A044961 1,2
%A A044961 _Clark Kimberling_