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A341269
as a simple table
n
a(n)
1
1
2
2
3
20
4
548
5
40440
6
8442742
7
5088482972
8
8963926817126
9
46591697187961736
[1,2,20,548,40440,8442742,5088482972, 8963926817126,46591697187961736]