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A140957 as a simple table

na(n)
02
12
21
34
41
51
68
71
81
92
1016
112
121
131
144
1532
164
171
181
192
208
2164
228
232
241
251
264
2716
28128
2916
304
311
321
332
348
3532
36256
3732
388
392
401
411
424
4316
4464
45512
4664
4716
484
491

[2,2,1,4,1,1,8,1,1,2,16,2,1,1,4,32,4,1,1,2,8,64,8,
 2,1,1,4,16,128,16,4,1,1,2,8,32,256,32,8,2,1,1,4,
 16,64,512,64,16,4,1]