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A001668 as a simple table

n a(n)
0 1
1 3
2 6
3 12
4 24
5 48
6 90
7 174
8 336
9 648
10 1218
11 2328
12 4416
13 8388
14 15780
15 29892
16 56268
17 106200
18 199350
19 375504
20 704304
21 1323996
22 2479692
23 4654464
24 8710212
25 16328220
26 30526374
27 57161568
28 106794084
29 199788408
30 372996450
31 697217994
32 1300954248

[1,3,6,12,24,48,90,174,336,648,1218,2328,4416,
 8388,15780,29892,56268,106200,199350,375504,
 704304,1323996,2479692,4654464,8710212,16328220,
 30526374,57161568,106794084,199788408,372996450,
 697217994,1300954248]

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Last modified June 22 18:49 EDT 2021. Contains 345388 sequences. (Running on oeis4.)