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A064846 as a simple table

n a(n)
1 1
2 1
3 1
4 3
5 18
6 720
7 1119600
8 2726809311600
9 16145931379144511904735600
10 566327308576692897981544319968226968281922500063600

[1,1,1,3,18,720,1119600,2726809311600,
 16145931379144511904735600,
 56632730857669289798154431996822696828192250006360\
 0]

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Last modified March 28 09:04 EDT 2024. Contains 371240 sequences. (Running on oeis4.)