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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]

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Last modified January 22 19:22 EST 2022. Contains 350489 sequences. (Running on oeis4.)