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A331205 as a simple table

na(n)
02
13
25
3549755813881
417
597
6193
7140737488355201
8257
97681
1015361
11134215681
1212289
138380417
14114689

[2,3,5,549755813881,17,97,193,140737488355201,257,
 7681,15361,134215681,12289,8380417,114689]