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A008867 as a simple table

na(n)
21
33
43
56
67
76
810
912
1012
1110
1215
1318
1419
1518
1615
1721
1825
1927
2027
2125
2221
2328
2433
2536
2637
2736
2833
2928
3036
3142
3246
3348
3448
3546
3642
3736
3845
3952
4057
4160
4261
4360
4457
4552
4645
4755
4863
4969
5073
5175
5275
5373
5469
5563
5655
5766
5875
5982
6087
6190
6291
6390
6487
6582
6675
6766
6878
6988
7096
71102
72106
73108
74108
75106
76102
7796
7888
7978

[1,3,3,6,7,6,10,12,12,10,15,18,19,18,15,21,25,27,
 27,25,21,28,33,36,37,36,33,28,36,42,46,48,48,46,
 42,36,45,52,57,60,61,60,57,52,45,55,63,69,73,75,
 75,73,69,63,55,66,75,82,87,90,91,90,87,82,75,66,
 78,88,96,102,106,108,108,106,102,96,88,78]