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 A026175 #15 Jan 31 2020 08:30:05 %S A026175 1,3,7,9,15,19,21,25,27,33,39,43,45,51,55,57,61,63,69,73,75,79,81,87, %T A026175 93,97,99,105,111,115,117,123,127,129,133,135,141,147,151,153,159,163, %U A026175 165,169,171,177,181,183,187,189,195,201,205,207 %N A026175 Duplicate of A026139. %K A026175 dead %O A026175 1,2