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A217630 as a simple table

na(n)
12
26
366
41418
583074
611181454
73709621842
82950299178242
95681245408101350
1026398983976826626170

[2,6,66,1418,83074,11181454,3709621842,
 2950299178242,5681245408101350,
 26398983976826626170]