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A220633 as a simple table

n a(n)
1 1
2 1
3 3
4 12
5 44
6 158
7 564
8 2010
9 7160
10 25502
11 90828
12 323490
13 1152128
14 4103366
15 14614356
16 52049802
17 185378120
18 660233966
19 2351458140
20 8374842354
21 29827443344
22 106232014742
23 378350930916
24 1347516822234
25 4799252328536
26 17092790630078

[1,1,3,12,44,158,564,2010,7160,25502,90828,323490,
 1152128,4103366,14614356,52049802,185378120,
 660233966,2351458140,8374842354,29827443344,
 106232014742,378350930916,1347516822234,
 4799252328536,17092790630078]

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Last modified May 10 22:11 EDT 2021. Contains 343780 sequences. (Running on oeis4.)