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A246212 as a simple table

na(n)
21
39
493
51155
617025
7292383
85752131
9127790505
103167896005
1186756071545
122602658092419
1384917405260779
142994675198208785
15113538315994418175

[1,9,93,1155,17025,292383,5752131,127790505,
 3167896005,86756071545,2602658092419,
 84917405260779,2994675198208785,
 113538315994418175]