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A181569 as a simple table

na(n)
11
21
32
41
56
61
78
89
910
101
1112
121
1314
1415
1516
161
1718
181
1920
2021
2122
221
2324
2425
2526
2627
2728
281
2930
301
3132
3233
3334
3435
3536
361
3738
3839
3940
401
4142
421
4344
4445
4546
461
4748
4849
4950
5051
5152
521
5354
5455
5556
5657
5758
581
5960
601
6162
6263
6364
6465
6566
661
6768
6869
6970
701
7172
721
7374
7475
7576
7677
7778
781

[1,1,2,1,6,1,8,9,10,1,12,1,14,15,16,1,18,1,20,21,
 22,1,24,25,26,27,28,1,30,1,32,33,34,35,36,1,38,39,
 40,1,42,1,44,45,46,1,48,49,50,51,52,1,54,55,56,57,
 58,1,60,1,62,63,64,65,66,1,68,69,70,1,72,1,74,75,
 76,77,78,1]