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A146673 as a simple table

na(n)
11
21
31
41
51
617
751
8293
91459
107621
1156935
12702993
138365419
14152139369
152979251133

[1,1,1,1,1,17,51,293,1459,7621,56935,702993,
 8365419,152139369,2979251133]