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A104089 as a simple table

n a(n)
1 3
2 13
3 61
4 251
5 1021
6 4093
7 16381
8 65521
9 262139
10 1048573
11 4194301
12 16777213
13 67108859
14 268435399
15 1073741789
16 4294967291
17 17179869143
18 68719476731
19 274877906899
20 1099511627689
21 4398046511093
22 17592186044399
23 70368744177643

[3,13,61,251,1021,4093,16381,65521,262139,1048573,
 4194301,16777213,67108859,268435399,1073741789,
 4294967291,17179869143,68719476731,274877906899,
 1099511627689,4398046511093,17592186044399,
 70368744177643]

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Last modified January 28 13:29 EST 2020. Contains 331321 sequences. (Running on oeis4.)