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A146729 as a simple table

na(n)
11
21
31
41
517
635
7131
8817
94781
1041379
11493009
125930505
13104085935
142108933179

[1,1,1,1,17,35,131,817,4781,41379,493009,5930505,
 104085935,2108933179]