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A200045 as a simple table

n a(n)
1 4
2 16
3 252
4 64
5 3912
6 228984
7 256
8 59928
9 12870096
10 2545607472
11 1024
12 906912
13 696448224
14 465659203104
15 272454472598400
16 4096
17 13571712
18 36376835616
19 79102304162784
20 140221913588582784

[4,16,252,64,3912,228984,256,59928,12870096,
 2545607472,1024,906912,696448224,465659203104,
 272454472598400,4096,13571712,36376835616,
 79102304162784,140221913588582784]

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Last modified August 13 16:07 EDT 2022. Contains 356107 sequences. (Running on oeis4.)