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A001715 as a simple table

n a(n)
3 1
4 4
5 20
6 120
7 840
8 6720
9 60480
10 604800
11 6652800
12 79833600
13 1037836800
14 14529715200
15 217945728000
16 3487131648000
17 59281238016000
18 1067062284288000
19 20274183401472000
20 405483668029440000
21 8515157028618240000
22 187333454629601280000
23 4308669456480829440000

[1,4,20,120,840,6720,60480,604800,6652800,
 79833600,1037836800,14529715200,217945728000,
 3487131648000,59281238016000,1067062284288000,
 20274183401472000,405483668029440000,
 8515157028618240000,187333454629601280000,
 4308669456480829440000]

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Last modified February 17 18:08 EST 2019. Contains 320222 sequences. (Running on oeis4.)