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 A083154 #8 Sep 25 2019 04:22:11 %S A083154 23,11,91,11,234,9901,11,9091,511858,999001,101,99009901,99990001, %T A083154 9999900001,10001,99990001,99999990000001 %N A083154 a(n) = A083153(n+1)/A083153(n). %Y A083154 Cf. A083153. %K A083154 nonn,base,more %O A083154 1,1 %A A083154 _Amarnath Murthy_ and Meenakshi Srikanth (menakan_s(AT)yahoo.com), Apr 25 2003 %E A083154 More terms from _Patrick De Geest_, Jun 05 2003 %E A083154 a(13)-a(17) from _Giovanni Resta_, Sep 25 2019