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A153281 as a simple table

na(n)
01
12
21
34
42
52
68
74
84
93
1016
118
128
136
145
1532
1616
1716
1812
1910
208
2164
2232
2332
2424
2520
2616
2713
28128
2964
3064
3148
3240
3332
3426
3521
36256
37128
38128
3996
4080
4164
4252
4342
4434
45512
46256
47256
48192
49160
50128
51104
5284
5368
5455

[1,2,1,4,2,2,8,4,4,3,16,8,8,6,5,32,16,16,12,10,8,
 64,32,32,24,20,16,13,128,64,64,48,40,32,26,21,256,
 128,128,96,80,64,52,42,34,512,256,256,192,160,128,
 104,84,68,55]