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A003991 as a simple table

na(n)
11
22
32
43
54
63
74
86
96
104
115
128
139
148
155
166
1710
1812
1912
2010
216
227
2312
2415
2516
2615
2712
287
298
3014
3118
3220
3320
3418
3514
368
379
3816
3921
4024
4125
4224
4321
4416
459
4610
4718
4824
4928
5030
5130
5228
5324
5418
5510
5611
5720
5827
5932
6035
6136
6235
6332
6427
6520
6611
6712
6822
6930
7036
7140
7242
7342
7440
7536
7630
7722
7812

[1,2,2,3,4,3,4,6,6,4,5,8,9,8,5,6,10,12,12,10,6,7,
 12,15,16,15,12,7,8,14,18,20,20,18,14,8,9,16,21,24,
 25,24,21,16,9,10,18,24,28,30,30,28,24,18,10,11,20,
 27,32,35,36,35,32,27,20,11,12,22,30,36,40,42,42,
 40,36,30,22,12]

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