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A221588 as a simple table

n a(n)
1 4
2 40
3 418
4 3760
5 31416
6 256736
7 2075520
8 16690688
9 133871616
10 1072357376
11 8584396800
12 68697325568
13 549667209216
14 4397692092416
15 35182954414080
16 281469306011648
17 2251777130889216
18 18014307778297856
19 144114825151119360

[4,40,418,3760,31416,256736,2075520,16690688,
 133871616,1072357376,8584396800,68697325568,
 549667209216,4397692092416,35182954414080,
 281469306011648,2251777130889216,
 18014307778297856,144114825151119360]

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Last modified September 17 08:57 EDT 2019. Contains 327128 sequences. (Running on oeis4.)