A289673 - OEIS

A289673 as a simple table

n	a(n)
1	-1
2	12
3	1
4	1
5	212
6	212
7	11
8	11
9	11
10	11
11	2212
12	2212
13	2212
14	2212
15	111
16	211
17	111
18	211
19	111
20	211
21	111
22	211
23	12212
24	22212
25	12212
26	22212
27	12212
28	22212
29	12212
30	22212
31	1111
32	1211
33	2111
34	2211
35	1111
36	1211
37	2111
38	2211
39	1111
40	1211
41	2111
42	2211
43	1111
44	1211
45	2111
46	2211
47	112212

[-1,12,1,1,212,212,11,11,11,11,2212,2212,2212, 2212,111,211,111,211,111,211,111,211,12212,22212, 12212,22212,12212,22212,12212,22212,1111,1211, 2111,2211,1111,1211,2111,2211,1111,1211,2111,2211, 1111,1211,2111,2211,112212]