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A068156 as a simple table

n a(n)
0 1
1 3
2 9
3 21
4 45
5 93
6 189
7 381
8 765
9 1533
10 3069
11 6141
12 12285
13 24573
14 49149
15 98301
16 196605
17 393213
18 786429
19 1572861
20 3145725
21 6291453
22 12582909
23 25165821
24 50331645
25 100663293
26 201326589
27 402653181
28 805306365
29 1610612733

[1,3,9,21,45,93,189,381,765,1533,3069,6141,12285,
 24573,49149,98301,196605,393213,786429,1572861,
 3145725,6291453,12582909,25165821,50331645,
 100663293,201326589,402653181,805306365,
 1610612733]

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Last modified July 31 04:12 EDT 2021. Contains 346367 sequences. (Running on oeis4.)