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 A297065 #12 Dec 26 2017 17:27:41 %S A297065 0,1,10,100,101,102,120,201,210,1002,1012,1020,1021,1022,1023,1032, %T A297065 1203,1230,1302,1320,2013,2031,2103,2130,2301,2310,3012,3021,3102, %U A297065 3120,3201,3210,10234,10243,10324,10342,10423,10432,12034,12043,12304,12340,12403,12430,13024 %N A297065 Starting with a(1) = 0, a(2) = 1, a(n) = smallest nonnegative integer not yet in the sequence that shares all digits with previous terms. %C A297065 Without the restriction that no repeated digits are allowed (as in A297062), the sequence is infinite. %C A297065 The smallest 10-digit term is 1023456789, the largest 10-digit term is 9876543210, and digits not contained in previous terms are introduced at n = 6, 15, 33, 129, 729, 5049, 40329, 362889. %e A297065 a(6)=102 and not 110 since 102 < 110, hence the digit 2 is introduced at n=6. %Y A297065 Cf. A297062. %K A297065 base,nonn %O A297065 1,3 %A A297065 _Enrique Navarrete_, Dec 24 2017