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A261834
as a simple table
n
a(n)
0
1
1
6
2
48
3
468
4
5328
5
68928
6
994464
7
15781920
8
272594160
9
5081825664
[1,6,48,468,5328,68928,994464,15781920,272594160, 5081825664]