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 A376300 #8 Oct 15 2024 23:17:16
%S A376300 0,1,2,3,4,5,6,7,8,9,10,12,21,23,32,34,43,45,54,56,65,67,76,78,87,89,
%T A376300 90,98,102,109,120,123,132,190,201,210,213,231,234,243,312,321,324,
%U A376300 342,345,354,423,432,435,453,456,465,534,543,546,564,567,576
%N A376300 Numbers whose digits can be rearranged to form a substring of 123456789012345678901234....
%H A376300 Andrew Howroyd, <a href="/A376300/b376300.txt">Table of n, a(n) for n = 1..10000</a>
%o A376300 (PARI) isok(n)={my(f=vector(10)); foreach(digits(n), t, f[1+t]++); vecmax(f)<=vecmin(f)+1 && sum(k=1, 9, f[k]!=f[k+1])<=2}
%Y A376300 Cf. A068708, A068710, A068804.
%K A376300 nonn,base
%O A376300 1,3
%A A376300 _Andrew Howroyd_, Sep 19 2024