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A123771
as a simple table
n
a(n)
1
1
2
2
3
12
4
45
5
264
6
1128
7
6991
8
32202
9
202856
10
973242
11
6204349
[1,2,12,45,264,1128,6991,32202,202856,973242, 6204349]
