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A006157 as a simple table

n a(n)
2 1
3 5
4 28
5 180
6 1320
7 10920
8 100800
9 1028160
10 11491200
11 139708800
12 1836172800
13 25945920000
14 392302310400
15 6320426112000
16 108101081088000
17 1956280854528000
18 37347179950080000
19 750144785854464000
20 15813863053148160000
21 349121438173347840000

[1,5,28,180,1320,10920,100800,1028160,11491200,
 139708800,1836172800,25945920000,392302310400,
 6320426112000,108101081088000,1956280854528000,
 37347179950080000,750144785854464000,
 15813863053148160000,349121438173347840000]

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Last modified March 19 06:53 EDT 2024. Contains 370953 sequences. (Running on oeis4.)