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A031086 as a simple table

na(n)
11
22
33
44
55
66
77
88
99
1011
111
1215
1317
1419
1521
1623
1725
1827
1914
2031
212
2235
2337
2439
2541
2643
2745
2816
2934
3051
313
3255
3357
3459
3561
3663
3718
3836
3954
4071
414
4275
4377
4479
4581
4620
4738
4856
4974
5091
515
5295
5397
5499
5522
5640
5758
5876
5994
60111
616
62115
63117
6424
6542

[1,2,3,4,5,6,7,8,9,11,1,15,17,19,21,23,25,27,14,
 31,2,35,37,39,41,43,45,16,34,51,3,55,57,59,61,63,
 18,36,54,71,4,75,77,79,81,20,38,56,74,91,5,95,97,
 99,22,40,58,76,94,111,6,115,117,24,42]