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A047121 as a simple table

n a(n)
0 1
1 2
2 3
3 5
4 9
5 18
6 36
7 69
8 134
9 263
10 526
11 1052
12 2085
13 4143
14 8250
15 16500
16 33000
17 65851
18 131484
19 262668
20 525336
21 1050672
22 2100045
23 4198157
24 8393603
25 16787206
26 33574412
27 67136750
28 134255332
29 268484858
30 536969716
31 1073939432
32 2147761687

[1,2,3,5,9,18,36,69,134,263,526,1052,2085,4143,
 8250,16500,33000,65851,131484,262668,525336,
 1050672,2100045,4198157,8393603,16787206,33574412,
 67136750,134255332,268484858,536969716,1073939432,
 2147761687]

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Last modified January 25 15:34 EST 2022. Contains 350572 sequences. (Running on oeis4.)