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A056257
as a simple table
n
a(n)
1
1
2
3
3
7
4
27
5
63
6
723
7
1785
8
7275
9
19461
10
24213
11
51777
12
131391
[1,3,7,27,63,723,1785,7275,19461,24213,51777, 131391]