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A216727
as a simple table
n
a(n)
3
1
4
6
5
18
6
93
7
600
8
4320
9
35168
10
321630
11
3257109
12
36199458
13
438126986
14
5736774869
[1,6,18,93,600,4320,35168,321630,3257109,36199458, 438126986,5736774869]