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A203421 as a simple table

n a(n)
1 1
2 -2
3 -18
4 1152
5 720000
6 -5598720000
7 -658683809280000
8 1381360067999170560000
9 59463021447701323327733760000
10 -59463021447701323327733760000000000000
11 -1542317635347398938581016812202229760000000000000

[1,-2,-18,1152,720000,-5598720000,
 -658683809280000,1381360067999170560000,
 59463021447701323327733760000,
 -59463021447701323327733760000000000000,
 -1542317635347398938581016812202229760000000000000\
 ]

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Last modified April 16 08:27 EDT 2024. Contains 371698 sequences. (Running on oeis4.)