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A082820 as a simple table

n a(n)
1 1
2 15
3 56
4 21879
5 129024
6 343755125
7 1026432000
8 2332446667551
9 129148759900160
10 823630739283455229
11 4840297233408000000
12 141571226444687853188375
13 2294760861764105011200000

[1,15,56,21879,129024,343755125,1026432000,
 2332446667551,129148759900160,823630739283455229,
 4840297233408000000,141571226444687853188375,
 2294760861764105011200000]

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Last modified September 21 04:10 EDT 2021. Contains 347596 sequences. (Running on oeis4.)