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A267899
as a simple table
n
a(n)
1
1
2
3
3
20
4
138
5
1488
6
20400
7
317520
8
5911920
9
126080640
10
2999566080
11
79604985600
[1,3,20,138,1488,20400,317520,5911920,126080640, 2999566080,79604985600]