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A013090 as a simple table

n a(n)
0 1
1 4
2 80
3 4120
4 394880
5 61069600
6 13845756800
7 4331363670400
8 1786609560320000
9 939754328209216000
10 613833877949676800000
11 487486352498634760960000
12 462560462591422971975680000 

[1,4,80,4120,394880,61069600,13845756800,
 4331363670400,1786609560320000,939754328209216000,
 613833877949676800000,487486352498634760960000,
 462560462591422971975680000]

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Last modified January 30 21:32 EST 2023. Contains 359947 sequences. (Running on oeis4.)