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A000818
as a simple table
n
a(n)
1
64
2
960
3
135040
4
14333211520
5
7923543700147758911104
6
311384101966962110823277061581833720077525851776
[64,960,135040,14333211520,7923543700147758911104, 311384101966962110823277061581833720077525851776]