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A180975 as a simple table

na(n)
11
21
32
41
53
63
71
83
96
104
111
123
137
1410
155
161
173
187
1914
2015
216
221
233
247
2515
2625
2721
287
291
303
317
3215
3330
3441
3528
368
371
383
397
4015
4131
4256
4363
4436
459
461
473
487
4915
5031
5162
5298
5392
5445
5510

[1,1,2,1,3,3,1,3,6,4,1,3,7,10,5,1,3,7,14,15,6,1,3,
 7,15,25,21,7,1,3,7,15,30,41,28,8,1,3,7,15,31,56,
 63,36,9,1,3,7,15,31,62,98,92,45,10]