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A147405 as a simple table

na(n)
11
21
31
49
525
661
7265
82725
940501
10485293
115980517
12124941205
134561553811
14214166188181
1510710509884487
16650335804942117

[1,1,1,9,25,61,265,2725,40501,485293,5980517,
 124941205,4561553811,214166188181,10710509884487,
 650335804942117]