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A071304 as a simple table

n a(n)
1 1
2 4
3 120
4 14400
5 9360000
6 29016000000
7 457002000000000
8 35646156000000000000
9 13946558535000000000000000
10 27230655539587500000000000000000
11 266009466302345390625000000000000000000
12 12987912192212013697265625000000000000000000000 

[1,4,120,14400,9360000,29016000000,
 457002000000000,35646156000000000000,
 13946558535000000000000000,
 27230655539587500000000000000000,
 266009466302345390625000000000000000000,
 12987912192212013697265625000000000000000000000]

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Last modified April 24 14:13 EDT 2024. Contains 371960 sequences. (Running on oeis4.)