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A000893
as a simple table
n
a(n)
1
2
2
8
3
214
4
10740500
5
5895494078673763322
6
231684599677799190148636584446502265460151192
[2,8,214,10740500,5895494078673763322, 231684599677799190148636584446502265460151192]