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A364234
as a simple table
n
a(n)
1
1
2
2
3
6
4
24
5
120
6
718
7
5036
8
40316
9
362862
10
3628786
11
39916701
12
479001517
[1,2,6,24,120,718,5036,40316,362862,3628786, 39916701,479001517]