A089600 - OEIS

A089600 as a simple table

n	a(n)
0	0
1	1
2	2
3	11
4	12
5	21
6	102
7	111
8	112
9	121
10	202
11	211
12	1012
13	1021
14	1102
15	1111
16	1112
17	1121
18	1202
19	1211
20	2012
21	2021
22	2102
23	2111
24	10112
25	10121
26	10202
27	10211
28	11012
29	11021
30	11102
31	11111
32	11112
33	11121
34	11202
35	11211
36	12012
37	12021
38	12102
39	12111
40	20112

[0,1,2,11,12,21,102,111,112,121,202,211,1012,1021, 1102,1111,1112,1121,1202,1211,2012,2021,2102,2111, 10112,10121,10202,10211,11012,11021,11102,11111, 11112,11121,11202,11211,12012,12021,12102,12111, 20112]