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A133945 as a simple table

na(n)
11
20
33
42
55
62
77
86
99
108
1111
126
1313
1412
1515
1614
1717
1814
1919
2012
2121
2220
2323
2418
2525
2624
2727
2826
2929
3020
3131
3230
3333
3432
3535
3630
3737
3836
3939
4032
4141
4230
4343
4442
4545
4644
4747
4842
4949
5048
5151
5250
5353
5450
5555
5644
5757
5856
5959
6048
6161
6260
6363
6462
6565
6662
6767
6866
6969
7068
7171
7256
7373

[1,0,3,2,5,2,7,6,9,8,11,6,13,12,15,14,17,14,19,12,
 21,20,23,18,25,24,27,26,29,20,31,30,33,32,35,30,
 37,36,39,32,41,30,43,42,45,44,47,42,49,48,51,50,
 53,50,55,44,57,56,59,48,61,60,63,62,65,62,67,66,
 69,68,71,56,73]