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A147416 as a simple table

na(n)
11
21
31
41
51
63
79
820
953
10192
11789
124160
1325089
14166861
151330315
1612854522

[1,1,1,1,1,3,9,20,53,192,789,4160,25089,166861,
 1330315,12854522]