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A007971 as a simple table

n a(n)
0 0
1 1
2 2
3 2
4 4
5 8
6 18
7 42
8 102
9 254
10 646
11 1670
12 4376
13 11596
14 31022
15 83670
16 227268
17 621144
18 1706934
19 4713558
20 13072764
21 36398568
22 101704038
23 285095118
24 801526446
25 2259520830
26 6385455594
27 18086805002
28 51339636952
29 146015545604

[0,1,2,2,4,8,18,42,102,254,646,1670,4376,11596,
 31022,83670,227268,621144,1706934,4713558,
 13072764,36398568,101704038,285095118,801526446,
 2259520830,6385455594,18086805002,51339636952,
 146015545604]

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Last modified February 22 04:10 EST 2018. Contains 299428 sequences. (Running on oeis4.)