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A070321 as a simple table

na(n)
11
22
33
43
55
66
77
87
97
1010
1111
1211
1313
1414
1515
1615
1717
1817
1919
2019
2121
2222
2323
2423
2523
2626
2726
2826
2929
3030
3131
3231
3333
3434
3535
3635
3737
3838
3939
4039
4141
4242
4343
4443
4543
4646
4747
4847
4947
5047
5151
5251
5353
5453
5555
5655
5757
5858
5959
6059
6161
6262
6362
6462
6565
6666
6767
6867
6969
7070
7171
7271

[1,2,3,3,5,6,7,7,7,10,11,11,13,14,15,15,17,17,19,
 19,21,22,23,23,23,26,26,26,29,30,31,31,33,34,35,
 35,37,38,39,39,41,42,43,43,43,46,47,47,47,47,51,
 51,53,53,55,55,57,58,59,59,61,62,62,62,65,66,67,
 67,69,70,71,71]