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k th digit of a(n) is the number of different digits within 4 of k (not including k).
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%I #7 Mar 05 2021 03:24:29

%S 11,111,122,212,221,1111,1222,2122,2212,2221,11111,12222,21222,22122,

%T 22212,22221,111111,122221,212222,221222,222122,222212,1111111,

%U 1222212,1222221,1333322,2122221,2212222,2221222,2222122,2233331,11111111,12222122,12222212

%N k th digit of a(n) is the number of different digits within 4 of k (not including k).

%K base,easy,nonn

%O 1,1

%A _Erich Friedman_

%E Offset corrected and missing 11 and more terms from _Sean A. Irvine_, Mar 04 2021