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A055746 as a simple table

n a(n)
0 1
1 1
2 2
3 20
4 2800
5 16464000
6 12778698240000
7 4254956888736153600000
8 2026001446509988558521630720000000
9 4690285643617101997210180025102660272128000000000

[1,1,2,20,2800,16464000,12778698240000,
 4254956888736153600000,
 2026001446509988558521630720000000,
 4690285643617101997210180025102660272128000000000]

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Last modified May 20 12:47 EDT 2013. Contains 225460 sequences.