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 A276406 #5 Sep 14 2016 13:31:07 %S A276406 9,11,22,33,53,55,57,66,68,77,79,90,103,114,134,136,147,158,160,171, %T A276406 182,202,204,206,215,217,226,228,239,263,283,285,296,307,309,320,327, %U A276406 329,331,340,342,351,353,364,366,377,388,408,410,412,421,423,432,434,445,456,469,476,478,480,489,491,500 %N A276406 Positions of 1's in A276404. %H A276406 N. J. A. Sloane, <a href="/A276406/b276406.txt">Table of n, a(n) for n = 1..2347</a> %Y A276406 Cf. A140098, A140099, A140100, A140101, A275926, A276404, A276405. %K A276406 nonn %O A276406 1,1 %A A276406 _N. J. A. Sloane_, Sep 14 2016