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A000821
as a simple table
n
a(n)
1
36
2
330
3
22060
4
920737780
5
247617673784972437216
6
4865376593267541575898325655326600134256578720
[36,330,22060,920737780,247617673784972437216, 4865376593267541575898325655326600134256578720]