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A137661 as a simple table

na(n)
11
21
32
41
53
62
73
84
94
105
115
126
136
147
157
168
178
189
1910
2011
219
2212
2313
2410
2514
2615
2716
2817
2911
3012
3118
3219
3313
3414
3520
3621
3722
3823
3915
4024
4125
4226
4327
4428
4529
4616
4730
4831
4917
5018
5132
5233
5334
5435
5536
5637
5719
5820
5938
6039
6140
6241
6321
6442
6543
6622
6744
6845
6946
7047
7123
7224
7348
7449
7550
7651

[1,1,2,1,3,2,3,4,4,5,5,6,6,7,7,8,8,9,10,11,9,12,
 13,10,14,15,16,17,11,12,18,19,13,14,20,21,22,23,
 15,24,25,26,27,28,29,16,30,31,17,18,32,33,34,35,
 36,37,19,20,38,39,40,41,21,42,43,22,44,45,46,47,
 23,24,48,49,50,51]