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A097999 as a simple table

n a(n)
3 1
4 9
5 132
6 2700
7 70920
8 2275560
9 86264640
10 3772681920
11 186972105600
12 10355595465600
13 633892275878400
14 42495895579737600
15 3096545573029708800
16 243680880958010496000
17 20596410256606119936000
18 1860881636529774802944000
19 178975197401013144907776000
20 18256461815785805072068608000

[1,9,132,2700,70920,2275560,86264640,3772681920,
 186972105600,10355595465600,633892275878400,
 42495895579737600,3096545573029708800,
 243680880958010496000,20596410256606119936000,
 1860881636529774802944000,
 178975197401013144907776000,
 18256461815785805072068608000]

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Last modified April 19 19:02 EDT 2024. Contains 371798 sequences. (Running on oeis4.)