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 A342045 #15 Feb 28 2021 09:54:34 %S A342045 0,2,3,10,4,5,20,6,7,22,8,9,23,24,25,26,27,28,29,30,32,40,42,43,100, %T A342045 44,45,46,47,48,49,50,52,53,102,54,60,62,63,103,104,64,65,105,106,66, %U A342045 67,68,69,70,72,73,107,108,74,75,109,76,80,82,83,200,84,85,202,86,87,203,204,88,89,205,206,90,92,93 %N A342045 When a digit d is odd, the next digit is < d. %C A342045 After a(1) = 0, the sequence is always extended with the smallest positive integer not yet present that doesn't lead to a contradiction. %C A342045 No term ends in 1 (as this 1 would block the sequence). %H A342045 Rémy Sigrist, <a href="/A342045/b342045.txt">Table of n, a(n) for n = 1..10000</a> %H A342045 Rémy Sigrist, <a href="/A342045/a342045.gp.txt">PARI program for A342045</a> %o A342045 (PARI) See Links section. %Y A342045 Cf. A342042, A342043, A342044, A342046 and A342047 (variations on the same idea). %K A342045 base,nonn %O A342045 1,2 %A A342045 _Eric Angelini_, Feb 26 2021