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 A057610 #11 Jun 22 2022 02:35:28 %S A057610 1,21,321,4321,5432103,6543213,7654321,876543213,987654321 %N A057610 Smallest lucky number with a decimal expansion starting n, n-1, ..., 2, 1. %Y A057610 Cf. A000959, A053547. %K A057610 nonn,base,more,less %O A057610 0,2 %A A057610 _Naohiro Nomoto_, Oct 09 2000 %E A057610 More terms from _Sascha Kurz_, Mar 25 2002 %E A057610 Name clarified by _Sean A. Irvine_, Jun 21 2022