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A147160 as a simple table

na(n)
11
21
31
41
51
61
71
89
925
1053
1197
12275
13939
142977
1511455
1654387
17273381
181565737
198740687
2056416565
21398132663

[1,1,1,1,1,1,1,9,25,53,97,275,939,2977,11455,
 54387,273381,1565737,8740687,56416565,398132663]