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 A118294 #9 Feb 21 2023 15:40:24
%S A118294 19,92,30,4,5,6,7,8,9,10,2,3,4,5,6,7,8,9,10,2,3,4,5,6,7,8,9,10,2,3,4,
%T A118294 5,6,7,8,9,10,2,3,4,5,6,7,8,9,10,2,3,4,5,6,7,8,9,10,2,3,4,5,6,7,8,9,
%U A118294 10,2,3,4,5,6,7,8,9,10,2,3,4,5,6,7,8,9,10,2,3,4,5,6,7,8,9,10,2,3,4,5,6,7,8,9
%N A118294 Start with 19 and repeatedly reverse the digits and add 1 to get the next term.
%C A118294 After 3 steps enters a cycle of length 9.
%H A118294 N. J. A. Sloane and others, <a href="/wiki/Sequences_of_RADD_type">Sequences of RADD type</a>, OEIS wiki.
%t A118294 NestList[IntegerReverse[#]+1&,19,100] (* or *) PadRight[{19,92,30},100,{10,2,3,4,5,6,7,8,9}] (* _Harvey P. Dale_, Feb 21 2023 *)
%Y A118294 Cf. A118551.
%K A118294 base,nonn
%O A118294 1,1
%A A118294 Luc Stevens (lms022(AT)yahoo.com), May 14 2006