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A130626 as a simple table

n a(n)
0 3
1 3
2 4
3 9
4 21
5 44
6 87
7 171
8 340
9 681
10 1365
11 2732
12 5463
13 10923
14 21844
15 43689
16 87381
17 174764
18 349527
19 699051
20 1398100
21 2796201
22 5592405
23 11184812
24 22369623
25 44739243
26 89478484
27 178956969
28 357913941
29 715827884
30 1431655767
31 2863311531

[3,3,4,9,21,44,87,171,340,681,1365,2732,5463,
 10923,21844,43689,87381,174764,349527,699051,
 1398100,2796201,5592405,11184812,22369623,
 44739243,89478484,178956969,357913941,715827884,
 1431655767,2863311531]

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Last modified July 9 05:17 EDT 2020. Contains 335538 sequences. (Running on oeis4.)