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A320642 as a simple table

na(n)
12
21
33
42
54
63
72
81
93
102
114
123
135
144
153
162
174
183
195
204
216
225
234
243
255
264
273
282
294
303
312
321
333
342
354
363
375
384
393
402
414
423
435
444
456
465
474
483
495
504
516
525
537
546
555
564
576
585
594
603
615
624
633
642
654
663
675
684
696
705
714
723
735
744
756
765
777
786
795
804
816
825
837
846
858
867
876

[2,1,3,2,4,3,2,1,3,2,4,3,5,4,3,2,4,3,5,4,6,5,4,3,
 5,4,3,2,4,3,2,1,3,2,4,3,5,4,3,2,4,3,5,4,6,5,4,3,5,
 4,6,5,7,6,5,4,6,5,4,3,5,4,3,2,4,3,5,4,6,5,4,3,5,4,
 6,5,7,6,5,4,6,5,7,6,8,7,6]