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A267987 as a simple table

n a(n)
0 4
1 8
2 48
3 400
4 3920
5 42336
6 487872
7 5889312
8 73616400
9 945561760
10 12412647104
11 165878102208
12 2249987591488
13 30906422960000
14 429157758816000
15 6015361252737600
16 85011208292365200
17 1210159553338375200
18 17338543308064440000
19 249857534618318088000

[4,8,48,400,3920,42336,487872,5889312,73616400,
 945561760,12412647104,165878102208,2249987591488,
 30906422960000,429157758816000,6015361252737600,
 85011208292365200,1210159553338375200,
 17338543308064440000,249857534618318088000]

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Last modified April 18 08:08 EDT 2024. Contains 371769 sequences. (Running on oeis4.)