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A227791 as a simple table

n a(n)
0 1
1 2
2 8
3 36
4 176
5 940
6 5568
7 37128
8 280992
9 2410812
10 23250080
11 249164344
12 2934303264
13 37617633976
14 521009920256
15 7748175156240
16 123095897716800
17 2080205257723740
18 37253560076385120
19 704703668205036120
20 14039778681732928800
21 293831851498842784680

[1,2,8,36,176,940,5568,37128,280992,2410812,
 23250080,249164344,2934303264,37617633976,
 521009920256,7748175156240,123095897716800,
 2080205257723740,37253560076385120,
 704703668205036120,14039778681732928800,
 293831851498842784680]

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Last modified October 22 22:34 EDT 2019. Contains 328335 sequences. (Running on oeis4.)