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A147127 as a simple table

na(n)
11
21
31
41
51
61
71
81
93
107
1115
1227
1351
14137
15397
161327
174515
1815837
1961007
20262125
211291801

[1,1,1,1,1,1,1,1,3,7,15,27,51,137,397,1327,4515,
 15837,61007,262125,1291801]