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A280458 as a simple table

n a(n)
1 1
2 1
3 3
4 12
5 120
6 720
7 15120
8 241920
9 6531840
10 130636800
11 7185024000
12 172440576000
13 13450364928000
14 564915326976000
15 33894919618560000
16 2169274855587840000
17 295021380359946240000
18 15931154539437096960000
19 2724227426243743580160000
20 217938194099499486412800000

[1,1,3,12,120,720,15120,241920,6531840,130636800,
 7185024000,172440576000,13450364928000,
 564915326976000,33894919618560000,
 2169274855587840000,295021380359946240000,
 15931154539437096960000,2724227426243743580160000,
 217938194099499486412800000]

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Last modified September 20 05:24 EDT 2021. Contains 347577 sequences. (Running on oeis4.)