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A375093 as a simple table

na(n)
11
23
39
427
5133
6315
7747
82799
914175
10287061
11530079
123061987
1318371925
1473487701
15195967203
161175803221

[1,3,9,27,133,315,747,2799,14175,287061,530079,
 3061987,18371925,73487701,195967203,1175803221]