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A088553 as a simple table

na(n)
12
25
313
441
51093
6797161
721523361
8926510094425921
91716841910146256242328924544641
103754733257489862401973357979128773
116957596529882152968992225251835887181478451547013

[2,5,13,41,1093,797161,21523361,926510094425921,
 1716841910146256242328924544641,
 3754733257489862401973357979128773,
 6957596529882152968992225251835887181478451547013]