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A141307 as a simple table

n a(n)
1 2
2 4
3 24
4 208
5 2272
6 29504
7 441216
8 7447808
9 139951616
10 2897228800
11 65533753344
12 1608679247872
13 42607095439360
14 1211489065582592
15 36818002833014784
16 1191230067009978368
17 40888060455008731136
18 1484180363633916903424
19 56809679459301490950144
20 2287045885619374501396480
21 96608773951155028111654912

[2,4,24,208,2272,29504,441216,7447808,139951616,
 2897228800,65533753344,1608679247872,
 42607095439360,1211489065582592,36818002833014784,
 1191230067009978368,40888060455008731136,
 1484180363633916903424,56809679459301490950144,
 2287045885619374501396480,
 96608773951155028111654912]

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Last modified December 6 20:22 EST 2021. Contains 349567 sequences. (Running on oeis4.)