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 A043453 #10 Apr 24 2021 20:50:34 %S A043453 9,18,27,36,45,54,63,72,82,83,84,85,86,87,88,89,90,99,108,117,126,135, %T A043453 144,153,163,164,165,166,167,168,169,170,171,180,189,198,207,216,225, %U A043453 234,244,245,246,247,248,249,250,251,252,261 %N A043453 Numbers having one 0 in base 9. %H A043453 Harvey P. Dale, <a href="/A043453/b043453.txt">Table of n, a(n) for n = 1..1000</a> %t A043453 Select[Range[300],DigitCount[#,9,0]==1&] (* _Harvey P. Dale_, Jun 18 2012 *) %Y A043453 Cf. A007095. %K A043453 nonn,base %O A043453 1,1 %A A043453 _Clark Kimberling_