A121808 - OEIS

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A121808 as a simple table

n	a(n)
1	1
2	11
3	12
4	1121
5	1321
6	122131
7	132231
8	122232
9	112431
10	13213141
11	14213241
12	13223142
13	12233241
14	12233241
15	12233241
16	12233241
17	12233241
18	12233241
19	12233241
20	12233241
21	12233241
22	12233241

[1,11,12,1121,1321,122131,132231,122232,112431, 13213141,14213241,13223142,12233241,12233241, 12233241,12233241,12233241,12233241,12233241, 12233241,12233241,12233241]