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A047994 as a simple table

na(n)
11
21
32
43
54
62
76
87
98
104
1110
126
1312
146
158
1615
1716
188
1918
2012
2112
2210
2322
2414
2524
2612
2726
2818
2928
308
3130
3231
3320
3416
3524
3624
3736
3818
3924
4028
4140
4212
4342
4430
4532
4622
4746
4830
4948
5024
5132
5236
5352
5426
5540
5642
5736
5828
5958
6024
6160
6230
6348
6463
6548
6620
6766
6848
6944
7024
7170

[1,1,2,3,4,2,6,7,8,4,10,6,12,6,8,15,16,8,18,12,12,
 10,22,14,24,12,26,18,28,8,30,31,20,16,24,24,36,18,
 24,28,40,12,42,30,32,22,46,30,48,24,32,36,52,26,
 40,42,36,28,58,24,60,30,48,63,48,20,66,48,44,24,
 70]