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A066981 as a simple table

na(n)
11
22
33
44
54
66
77
86
99
108
117
1210
1312
1414
157
1611
1716
1811
1912
2010
2113
2214
2319
2414
2512
2624
2727
2820
2910
3014
3119
3222
3317
3420
3513
3615
3728
3813
3924
4010
4119
4226
4333
4420
4517
4621
4715
4817
4937
5024
5131
5236
5344
5429
5516
5628
5729
5820
5937
6018
6128
6221
6333
6442
6516
6634
6751
6826
6933
7026
7144
7217
7356

[1,2,3,4,4,6,7,6,9,8,7,10,12,14,7,11,16,11,12,10,
 13,14,19,14,12,24,27,20,10,14,19,22,17,20,13,15,
 28,13,24,10,19,26,33,20,17,21,15,17,37,24,31,36,
 44,29,16,28,29,20,37,18,28,21,33,42,16,34,51,26,
 33,26,44,17,56]