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A074023
as a simple table
n
a(n)
1
0
2
2
3
6
4
56
5
301
6
2450
7
16807
8
117992
9
823200
10
5762400
11
40356008
12
282475249
[0,2,6,56,301,2450,16807,117992,823200,5762400, 40356008,282475249]