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A220806 as a simple table

n a(n)
1 2
2 8
3 38
4 168
5 726
6 3088
7 12974
8 54000
9 223118
10 916552
11 3747670
12 15266264
13 61997350
14 251143328
15 1015242974
16 4097067104
17 16510377630
18 66454603032
19 267215894086
20 1073591223944
21 4310358413046
22 17295539333552
23 69365195543182

[2,8,38,168,726,3088,12974,54000,223118,916552,
 3747670,15266264,61997350,251143328,1015242974,
 4097067104,16510377630,66454603032,267215894086,
 1073591223944,4310358413046,17295539333552,
 69365195543182]

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Last modified October 3 14:55 EDT 2022. Contains 357237 sequences. (Running on oeis4.)