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A175966 as a simple table

na(n)
13
25
36
48
59
610
711
813
914
1015
1116
1217
1318
1420
1521
1622
1723
1824
1925
2026
2127
2228
2329
2431
2532
2633
2734
2835
2936
3037
3138
3239
3340
3441
3542
3644
3745
3846
3947
4048
4149
4250
4351
4452
4553
4654
4755
4856
4957
5058
5159
5261
5362
5463
5564
5665
5766
5867
5968
6069
6170
6271
6372
6473
6574
6675
6776
6877
6978
7080

[3,5,6,8,9,10,11,13,14,15,16,17,18,20,21,22,23,24,
 25,26,27,28,29,31,32,33,34,35,36,37,38,39,40,41,
 42,44,45,46,47,48,49,50,51,52,53,54,55,56,57,58,
 59,61,62,63,64,65,66,67,68,69,70,71,72,73,74,75,
 76,77,78,80]