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A171338
as a simple table
n
a(n)
1
1
2
2
3
6
4
24
5
104
6
622
7
4324
8
34548
9
310594
10
3164990
11
35155038
12
423974396
13
5541016736
14
78238104000
[1,2,6,24,104,622,4324,34548,310594,3164990, 35155038,423974396,5541016736,78238104000]