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A175015 as a simple table

n a(n)
1 0
2 20
3 6040
4 1824060
5 550860080
6 166357920100
7 50239541010120
8 15172175027136140
9 4581946618654104160
10 1383732706658512320180
11 417882695464252066590200
12 126199190297497465597920220

[0,20,6040,1824060,550860080,166357920100,
 50239541010120,15172175027136140,
 4581946618654104160,1383732706658512320180,
 417882695464252066590200,
 126199190297497465597920220]

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Last modified March 6 04:14 EST 2021. Contains 341841 sequences. (Running on oeis4.)