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A186970 as a simple table

na(n)
11
21
32
43
54
63
76
84
98
105
1110
127
1312
148
159
1612
1716
1811
1918
2012
2114
2214
2322
249
2524
2616
2718
2818
2928
3013
3130
3216
3322
3421
3525
3624
3736
3824
3927
4017
4140
4217
4342
4430
4533
4629
4746
4827
4948
5032
5136
5236
5352
5424
5542
5625
5740
5837
5958
6028
6160
6240
6349
6448
6550
6630
6766
6848
6949
7035
7170
7232
7372
7448
7554
7654
7761
7836

[1,1,2,3,4,3,6,4,8,5,10,7,12,8,9,12,16,11,18,12,
 14,14,22,9,24,16,18,18,28,13,30,16,22,21,25,24,36,
 24,27,17,40,17,42,30,33,29,46,27,48,32,36,36,52,
 24,42,25,40,37,58,28,60,40,49,48,50,30,66,48,49,
 35,70,32,72,48,54,54,61,36]