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 A342044 #11 Feb 28 2021 09:54:25 %S A342044 0,1,2,3,4,5,6,7,8,12,13,40,14,15,60,16,17,80,18,20,21,22,23,41,24,25, %T A342044 61,26,27,81,28,34,35,62,36,37,82,38,42,43,44,45,63,46,47,83,48,56,57, %U A342044 84,58,64,65,66,67,85,68,78,86,87,88,120,121,200,122,123,400,124,125,600,126,127,800,128 %N A342044 When a digit d is odd, the next digit is > d. %C A342044 The sequence is always extended with the smallest positive integer not yet present that doesn't lead to a contradiction. %C A342044 No digit 9 is present in the sequence (as 9, being odd, would block it). %H A342044 Rémy Sigrist, <a href="/A342044/b342044.txt">Table of n, a(n) for n = 1..10000</a> %H A342044 Rémy Sigrist, <a href="/A342044/a342044.gp.txt">PARI program for A342044</a> %o A342044 (PARI) See Links section. %Y A342044 Cf. A342042, A342043, A342045, A342046 and A342047 (variations on the same idea). %K A342044 base,nonn %O A342044 1,3 %A A342044 _Eric Angelini_, Feb 26 2021