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A147200 as a simple table

na(n)
11
21
31
41
51
65
713
845
9141
10593
112479
1213149
1373679
14588757
155000629
1656709831
17657094563

[1,1,1,1,1,5,13,45,141,593,2479,13149,73679,
 588757,5000629,56709831,657094563]