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 A083156 #8 Sep 25 2019 07:39:55 %S A083156 19,11,91,11,163,37,91,1001,9901,999001,11,9091,99909001,109889011 %N A083156 a(n) = A083155(n+1)/A083155(n). %Y A083156 Cf. A083155. %K A083156 nonn,base,more %O A083156 1,1 %A A083156 _Amarnath Murthy_ and Meenakshi Srikanth (menakan_s(AT)yahoo.com), Apr 25 2003 %E A083156 Corrected and extended by _Patrick De Geest_, Jun 05 2003 %E A083156 a(13)-a(14) from _Giovanni Resta_, Sep 25 2019