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A049603
as a simple table
n
a(n)
1
6
2
28
3
264
4
1104
5
3360
6
75840
7
6499584
8
151062912
9
2171581440
10
4686409728
11
316023611904
[6,28,264,1104,3360,75840,6499584,151062912, 2171581440,4686409728,316023611904]