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A147172 as a simple table

na(n)
11
21
31
41
51
61
71
81
99
109
1133
1233
1381
1481
15501
16501
179129
189129
19252307
20252307
214894765
224894765

[1,1,1,1,1,1,1,1,9,9,33,33,81,81,501,501,9129,
 9129,252307,252307,4894765,4894765]