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A147428 as a simple table

na(n)
11
21
31
49
525
689
7469
85217
982459
101354121
1128702995
12915889909
1344493843165
142922255231469

[1,1,1,9,25,89,469,5217,82459,1354121,28702995,
 915889909,44493843165,2922255231469]