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A195921 as a simple table

na(n)
12
23
35
47
59
610
711
813
915
1015
1115
1216
1317
1418
1519
1622
1723
1825
1926
2027
2129
2230
2332
2432
2533
2634
2735
2837
2938
3039
3141
3242
3345
3446
3548
3648
3748
3848
3951
4053
4154
4255
4357
4457
4561
4662
4763
4864
4964
5065
5166
5269
5369
5473
5575
5678
5778
5880
5980
6080
6186
6287
6390
6490
6593
6694
6795
6896

[2,3,5,7,9,10,11,13,15,15,15,16,17,18,19,22,23,25,
 26,27,29,30,32,32,33,34,35,37,38,39,41,42,45,46,
 48,48,48,48,51,53,54,55,57,57,61,62,63,64,64,65,
 66,69,69,73,75,78,78,80,80,80,86,87,90,90,93,94,
 95,96]