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A147500 as a simple table

na(n)
11
21
31
41
51
63
79
819
937
10159
11849
124243
1319707
14136969
151272775
1612839957

[1,1,1,1,1,3,9,19,37,159,849,4243,19707,136969,
 1272775,12839957]