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A074020
as a simple table
n
a(n)
1
0
2
2
3
6
4
49
5
350
6
2352
7
16807
8
117992
9
823200
10
5767202
11
40339201
12
282492056
[0,2,6,49,350,2352,16807,117992,823200,5767202, 40339201,282492056]