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A175781 as a simple table

na(n)
11
22
33
42
55
66
77
82
93
1010
1111
1212
1313
1414
1515
164
1717
1818
1919
2020
2121
2222
2323
2424
255
2626
273
2828
2929
3030
3131
322
3333
3434
3535
366
3737
3838
3939
4040
4141
4242
4343
4444
4545
4646
4747
4848
497
5050
5151
5252
5353
5454
5555
5656
5757
5858
5959
6060
6161
6262
6363
648
6565
6666
6767
6868
6969
7070
7171
7272
7373
7474
7575

[1,2,3,2,5,6,7,2,3,10,11,12,13,14,15,4,17,18,19,
 20,21,22,23,24,5,26,3,28,29,30,31,2,33,34,35,6,37,
 38,39,40,41,42,43,44,45,46,47,48,7,50,51,52,53,54,
 55,56,57,58,59,60,61,62,63,8,65,66,67,68,69,70,71,
 72,73,74,75]