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A147072 as a simple table

na(n)
11
21
31
41
51
61
71
81
91
101
111
121
131
141
153
163
179
189
1919
2019
2161
2261
23211
24211
25741
26741
273813

[1,1,1,1,1,1,1,1,1,1,1,1,1,1,3,3,9,9,19,19,61,61,
 211,211,741,741,3813]