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A374345
as a simple table
n
a(n)
0
1
1
1
2
5
3
59
4
2454
5
177998
6
36960008
7
7670953632
8
2822399976144
9
1061085324952592
10
598646324654443008
[1,1,5,59,2454,177998,36960008,7670953632, 2822399976144,1061085324952592,598646324654443008]