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A147174 as a simple table

na(n)
11
21
31
41
51
61
71
81
93
109
1119
1235
1381
14217
15621
161903
177803
1832967
19151167
20704477
213742519
2221530169

[1,1,1,1,1,1,1,1,3,9,19,35,81,217,621,1903,7803,
 32967,151167,704477,3742519,21530169]