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A031218 as a simple table

na(n)
11
22
33
44
55
65
77
88
99
109
1111
1211
1313
1413
1513
1616
1717
1817
1919
2019
2119
2219
2323
2423
2525
2625
2727
2827
2929
3029
3131
3232
3332
3432
3532
3632
3737
3837
3937
4037
4141
4241
4343
4443
4543
4643
4747
4847
4949
5049
5149
5249
5353
5453
5553
5653
5753
5853
5959
6059
6161
6261
6361
6464
6564
6664
6767
6867
6967
7067
7171
7271

[1,2,3,4,5,5,7,8,9,9,11,11,13,13,13,16,17,17,19,
 19,19,19,23,23,25,25,27,27,29,29,31,32,32,32,32,
 32,37,37,37,37,41,41,43,43,43,43,47,47,49,49,49,
 49,53,53,53,53,53,53,59,59,61,61,61,64,64,64,67,
 67,67,67,71,71]