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A091759 as a simple table

n a(n)
0 1
1 2
2 4
3 26
4 208
5 2222
6 29412
7 466034
8 8609344
9 181818182
10 4322904100
11 114308980106
12 3328297874640
13 105828636433886
14 3649115753173828
15 135637824071393762
16 5406799097296318720
17 230095953656704898102

[1,2,4,26,208,2222,29412,466034,8609344,181818182,
 4322904100,114308980106,3328297874640,
 105828636433886,3649115753173828,
 135637824071393762,5406799097296318720,
 230095953656704898102]

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Last modified December 2 11:44 EST 2021. Contains 349440 sequences. (Running on oeis4.)