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A181843 as a simple table

na(n)
11
21
33
41
53
66
71
83
98
1012
111
123
138
1418
1523
161
173
188
1920
2032
2138
221
233
248
2520
2638
2766
2873
291
303
318
3220
3340
3478
35110
36118
371
383
398
4020
4140
4284
43141
44189
45198
461
473
488
4920
5040
5186
52153
53253
54308
55318
561
573
588
5920
6040
6186
62159
63287
64409
65519
66530
671
683
698
7020
7140
7286
73161
74299
75476
76728
77807
78819

[1,1,3,1,3,6,1,3,8,12,1,3,8,18,23,1,3,8,20,32,38,
 1,3,8,20,38,66,73,1,3,8,20,40,78,110,118,1,3,8,20,
 40,84,141,189,198,1,3,8,20,40,86,153,253,308,318,
 1,3,8,20,40,86,159,287,409,519,530,1,3,8,20,40,86,
 161,299,476,728,807,819]