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A137903 as a simple table

na(n)
11
21
34
44
55
66
711
84
99
105
1111
123
1313
1414
1510
1616
1717
1818
1919
2020
2121
2211
2323
2424
2535
2613
2727
2814
2929
3030
3131
3216
3344
3417
3535
3618
3737
3819
3952
4020
4141
4235
4343
4444
4545
4623
4747
4812
4949
5050
5168
5252
5353
5445
5555
5656
5776
5829
5959
6047
6161
6231
6363
6464
6565
6666
6767
6868
6992
7035

[1,1,4,4,5,6,11,4,9,5,11,3,13,14,10,16,17,18,19,
 20,21,11,23,24,35,13,27,14,29,30,31,16,44,17,35,
 18,37,19,52,20,41,35,43,44,45,23,47,12,49,50,68,
 52,53,45,55,56,76,29,59,47,61,31,63,64,65,66,67,
 68,92,35]