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A147271 as a simple table

na(n)
11
21
31
41
51
63
79
823
945
10169
111061
126743
1340273
14284761
152852385
1636414365
17522818739
188493813357
19169218922641

[1,1,1,1,1,3,9,23,45,169,1061,6743,40273,284761,
 2852385,36414365,522818739,8493813357,
 169218922641]