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A028368 as a simple table

n a(n)
0 1
1 2
2 8
3 192
4 21504
5 10321920
6 20478689280
7 165140150353920
8 5369036568306647040
9 700981414358115837542400
10 366798338802685125615786393600
11 768480666818860817418136536376934400

[1,2,8,192,21504,10321920,20478689280,
 165140150353920,5369036568306647040,
 700981414358115837542400,
 366798338802685125615786393600,
 768480666818860817418136536376934400]

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Last modified September 26 20:34 EDT 2021. Contains 347672 sequences. (Running on oeis4.)