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A326244
as a simple table
n
a(n)
0
1
1
1
2
2
3
8
4
36
5
160
6
704
7
3088
8
13536
9
59328
10
260032
11
1139712
[1,1,2,8,36,160,704,3088,13536,59328,260032, 1139712]