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A197971
as a simple table
n
a(n)
1
1
2
1
3
1
4
50
5
244
6
854
7
141308
8
15242696
9
554207242
10
82170969714
11
75445949682688
[1,1,1,50,244,854,141308,15242696,554207242, 82170969714,75445949682688]