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A055165
as a simple table
n
a(n)
0
1
1
1
2
6
3
174
4
22560
5
12514320
6
28836612000
7
270345669985440
8
10160459763342013440
[1,1,6,174,22560,12514320,28836612000, 270345669985440,10160459763342013440]