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A240551 as a simple table

na(n)
12
2257
3193
465537
511489
698801
7169553
8673
921523361
105882353
116304673
12260753
13407865361
1416097
15179953
166700417
17184417
18113607841
19563377
201505882353
21300673
223227992561
23623009
242311681
2529423041
2657734881
27769
2822223646961
29561377
304855073

[2,257,193,65537,11489,98801,169553,673,21523361,
 5882353,6304673,260753,407865361,16097,179953,
 6700417,184417,113607841,563377,1505882353,300673,
 3227992561,623009,2311681,29423041,57734881,769,
 22223646961,561377,4855073]