A166668 - OEIS

A166668 as a simple table

n	a(n)
1	1
2	21
3	31
4	441
5	51
6	651
7	71
8	9261
9	961
10	1071
11	111
12	13671
13	131
14	1491
15	1581
16	194481
17	171
18	20181
19	191
20	22491
21	2201
22	2331
23	231
24	287091
25	2601
26	2751
27	29791
28	31311
29	291
30	33201
31	311
32	4084101
33	3441
34	3591
35	3621
36	423801
37	371
38	4011
39	4061
40	472311
41	411
42	46221
43	431

[1,21,31,441,51,651,71,9261,961,1071,111,13671, 131,1491,1581,194481,171,20181,191,22491,2201, 2331,231,287091,2601,2751,29791,31311,291,33201, 311,4084101,3441,3591,3621,423801,371,4011,4061, 472311,411,46221,431]