A168647 - OEIS

A168647 as a simple table

n	a(n)
0	1
1	1
2	1
3	1
4	11
5	1
6	1
7	21
8	111
9	1
10	1
11	31
12	321
13	1111
14	1
15	1
16	41
17	631
18	4321
19	11111
20	1
21	1
22	51
23	51
24	731
25	54321
26	111111
27	1
28	1
29	61
30	561
31	251
32	51731
33	654321
34	1111111
35	1
36	1
37	71
38	181
39	5861
40	53251
41	171731
42	7654321
43	11111111
44	1
45	1
46	81
47	891
48	6681
49	2961
50	604251
51	8371731
52	87654321
53	111111111
54	1

[1,1,1,1,11,1,1,21,111,1,1,31,321,1111,1,1,41,631, 4321,11111,1,1,51,51,731,54321,111111,1,1,61,561, 251,51731,654321,1111111,1,1,71,181,5861,53251, 171731,7654321,11111111,1,1,81,891,6681,2961, 604251,8371731,87654321,111111111,1]