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A006434
as a simple table
n
a(n)
1
4
2
120
3
1230
4
7424
5
32424
6
113584
7
338742
8
893220
9
2136618
10
4721728
11
9770904
[4,120,1230,7424,32424,113584,338742,893220, 2136618,4721728,9770904]