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A216478 as a simple table

n a(n)
1 1
2 2
3 12
4 12
5 -1
6 12
7 21
8 112
9 12222
10 -1
11 11
12 12
13 221
14 112
15 -1
16 112
17 221
18 12222
19 1121
20 -1
21 21
22 22
23 12121
24 2112
25 -1
26 1222
27 21222
28 112
29 12122
30 -1
31 11222
32 2112
33 1122
34 1122
35 -1
36 22212
37 111
38 12122
39 111111
40 -1
41 11111
42 12222
43 12212
44 2112
45 -1
46 122222
47 1222
48 2112
49 11221
50 -1
51 1122
52 21112
53 212
54 21222
55 -1
56 112
57 212211
58 12122
59 1121

[1,2,12,12,-1,12,21,112,12222,-1,11,12,221,112,-1,
 112,221,12222,1121,-1,21,22,12121,2112,-1,1222,
 21222,112,12122,-1,11222,2112,1122,1122,-1,22212,
 111,12122,111111,-1,11111,12222,12212,2112,-1,
 122222,1222,2112,11221,-1,1122,21112,212,21222,-1,
 112,212211,12122,1121]

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Last modified December 4 15:36 EST 2020. Contains 338928 sequences. (Running on oeis4.)