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A084286
as a simple table
n
a(n)
1
1
2
1
3
4
4
38
5
728
6
26704
7
1866255
8
251547611
9
66295198837
10
34494681184926
11
35636712584655663
[1,1,4,38,728,26704,1866255,251547611,66295198837, 34494681184926,35636712584655663]