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A147413 as a simple table

na(n)
11
21
31
49
525
681
7559
86336
995947
101549728
1136536673
121325100728
1367670472497
144585160114565
15421563951431911

[1,1,1,9,25,81,559,6336,95947,1549728,36536673,
 1325100728,67670472497,4585160114565,
 421563951431911]