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A013944 as a simple table

na(n)
12
23
34
46
57
65
76
89
98
1010
1110
127
138
1412
1517
1610
1714
1818
1913
209
2110
2215
2318
2416
2512
2625
2713
2814
2916
3011
3112
3218
3316
3415
3516
3614
3729
3820
3920
4034
4119
4213
4314
4421
4526
4622
4726
4820
4916
5022
5120
5227
5318
5436
5522
5615
5716
5824
5941
6020
6134
6224
6333
6418
6530
6620
6719
6840

[2,3,4,6,7,5,6,9,8,10,10,7,8,12,17,10,14,18,13,9,
 10,15,18,16,12,25,13,14,16,11,12,18,16,15,16,14,
 29,20,20,34,19,13,14,21,26,22,26,20,16,22,20,27,
 18,36,22,15,16,24,41,20,34,24,33,18,30,20,19,40]