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 A071271 #2 Nov 10 2007 03:00:00 %S A071271 0,1,2,3,4,5,6,7,8,9,91,101,111,121,131,141,151,161,171,181,182,192 %N A071271 Duplicate of A066492. %K A071271 dead %O A071271 1,3