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A089985 as a simple table

n a(n)
1 2
2 3
3 6
4 10
5 18
6 34
7 66
8 130
9 258
10 514
11 1026
12 2050
13 4098
14 8194
15 16386
16 32770
17 65538
18 131074
19 262146
20 524290
21 1048578
22 2097154
23 4194306
24 8388610
25 16777218
26 33554434
27 67108866
28 134217730
29 268435458
30 536870914
31 1073741826
32 2147483650

[2,3,6,10,18,34,66,130,258,514,1026,2050,4098,
 8194,16386,32770,65538,131074,262146,524290,
 1048578,2097154,4194306,8388610,16777218,33554434,
 67108866,134217730,268435458,536870914,1073741826,
 2147483650]

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Last modified October 15 15:36 EDT 2021. Contains 348033 sequences. (Running on oeis4.)