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A093440 as a simple table

n a(n)
1 1
2 4
3 20
4 100
5 720
6 7920
7 156960
8 4978909
9 162844632
10 9658482053
11 917891979225
12 113051563311936
13 21440096665285608
14 6394092372716939840
15 2723634378368868283440
16 1747667851609071536512000

[1,4,20,100,720,7920,156960,4978909,162844632,
 9658482053,917891979225,113051563311936,
 21440096665285608,6394092372716939840,
 2723634378368868283440,1747667851609071536512000]

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Last modified August 19 03:19 EDT 2024. Contains 375284 sequences. (Running on oeis4.)