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A146713 as a simple table

na(n)
11
21
31
41
51
621
747
8295
91465
107767
1165051
12795933
138973805
14164427495
153016356659
1681769439115

[1,1,1,1,1,21,47,295,1465,7767,65051,795933,
 8973805,164427495,3016356659,81769439115]