A075399 - OEIS

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A075399 as a simple table

n	a(n)
1	1
2	2
3	111
4	112
5	5
6	11112
7	21112
8	1111112
9	111111111
10	0
11	0
12	11111111112
13	21112111111
14	112111111112
15	11111111115
16	11111111112112
17	211111111121111
18	11111111111111112
19	21111111211111111
20	0
21	21111111111111111111

[1,2,111,112,5,11112,21112,1111112,111111111,0,0, 11111111112,21112111111,112111111112,11111111115, 11111111112112,211111111121111,11111111111111112, 21111111211111111,0,21111111111111111111]