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A081556 as a simple table

na(n)
21
32
45
54
68
76
811
98
1014
1110
1217
1312
1420
1514
1623
1716
1826
1918
2029
2120
2232
2322
2432
2524
2638
2726
2841
2928
3044
3130
3247
3332
3450
3534
3653
3736
3856
3938
4059
4140
4262
4342
4465
4544
4668
4746
4871
4948
5074
5150
5277
5352
5480
5554
5683
5756
5886
5958
6089
6160
6292
6362
6495
6564
6698
6766
68101
6968
70104
7170

[1,2,5,4,8,6,11,8,14,10,17,12,20,14,23,16,26,18,
 29,20,32,22,32,24,38,26,41,28,44,30,47,32,50,34,
 53,36,56,38,59,40,62,42,65,44,68,46,71,48,74,50,
 77,52,80,54,83,56,86,58,89,60,92,62,95,64,98,66,
 101,68,104,70]