%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