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A281589 as a simple table

na(n)
11
21
32
41
54
63
72
81
98
105
114
123
136
147
152
161
1716
189
198
205
2112
2213
234
243
2514
2611
276
287
2910
3015
312
321
3332
3417
3516
369
3724
3825
398
405
4128
4221
4312
4413
4520
4629
474
483
4930
5019
5114
5211
5322
5427
556
567
5726
5823
5910
6015
6118
6231
632
641
6564
6633
6732
6817
6948
7049
7116
729
7356
7441

[1,1,2,1,4,3,2,1,8,5,4,3,6,7,2,1,16,9,8,5,12,13,4,
 3,14,11,6,7,10,15,2,1,32,17,16,9,24,25,8,5,28,21,
 12,13,20,29,4,3,30,19,14,11,22,27,6,7,26,23,10,15,
 18,31,2,1,64,33,32,17,48,49,16,9,56,41]