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A331205
as a simple table
n
a(n)
0
2
1
3
2
5
3
549755813881
4
17
5
97
6
193
7
140737488355201
8
257
9
7681
10
15361
11
134215681
12
12289
13
8380417
14
114689
[2,3,5,549755813881,17,97,193,140737488355201,257, 7681,15361,134215681,12289,8380417,114689]