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A284429 as a simple table

na(n)
12
21
33
45
51
63
78
81
93
1011
111
123
1314
141
153
1617
171
183
1920
201
213
2223
231
243
2526
261
273
2829
291
303
3132
321
333
3435
351
363
3738
381
393
4041
411
423
4344
441
453
4647
471
483
4950
501
513
5253
531
543
5556
561
573
5859
591
603
6162
621
633
6465
651
663
6768
681
693
7071
711
723
7374
741
753

[2,1,3,5,1,3,8,1,3,11,1,3,14,1,3,17,1,3,20,1,3,23,
 1,3,26,1,3,29,1,3,32,1,3,35,1,3,38,1,3,41,1,3,44,
 1,3,47,1,3,50,1,3,53,1,3,56,1,3,59,1,3,62,1,3,65,
 1,3,68,1,3,71,1,3,74,1,3]