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A088819 as a simple table

n a(n)
0 1
1 1
2 2
3 6
4 22
5 100
6 518
7 3122
8 20676
9 154524
10 1238952
11 11030448
12 103376832
13 1068000024
14 11407673496
15 134352996744
16 1603035004368
17 21276244952784
18 278535036773856
19 4141886572833888
20 58405909554175776
21 973789956270781056
22 14462380128843907680

[1,1,2,6,22,100,518,3122,20676,154524,1238952,
 11030448,103376832,1068000024,11407673496,
 134352996744,1603035004368,21276244952784,
 278535036773856,4141886572833888,
 58405909554175776,973789956270781056,
 14462380128843907680]

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Last modified April 22 22:19 EDT 2021. Contains 343197 sequences. (Running on oeis4.)