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A378888 as a simple table

na(n)
11
21
33
42
55
61
77
81
99
101
1111
122
1313
141
1515
164
1717
181
1919
202
2121
221
2323
243
2525
261
2727
282
2929
301
3131
321
3333
341
3535
362
3737
381
3939
401
4141
421
4343
442
4545
461
4747
484
4949
501
5151
522
5353
541
5555
561
5757
581
5959
602
6161
621
6363
642
6565
661
6767
682
6969
701
7171
723
7373
741
7575
762

[1,1,3,2,5,1,7,1,9,1,11,2,13,1,15,4,17,1,19,2,21,
 1,23,3,25,1,27,2,29,1,31,1,33,1,35,2,37,1,39,1,41,
 1,43,2,45,1,47,4,49,1,51,2,53,1,55,1,57,1,59,2,61,
 1,63,2,65,1,67,2,69,1,71,3,73,1,75,2]