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A180143 as a simple table

n a(n)
0 1
1 4
2 16
3 58
4 208
5 742
6 2644
7 9418
8 33544
9 119470
10 425500
11 1515442
12 5397328
13 19222870
14 68463268
15 243835546
16 868433176
17 3092970622
18 11015778220
19 39233275906
20 139731384160
21 497660704294
22 1772444881204
23 6312656052202

[1,4,16,58,208,742,2644,9418,33544,119470,425500,
 1515442,5397328,19222870,68463268,243835546,
 868433176,3092970622,11015778220,39233275906,
 139731384160,497660704294,1772444881204,
 6312656052202]

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Last modified September 26 11:22 EDT 2021. Contains 347665 sequences. (Running on oeis4.)