A052639 - OEIS

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A052639 as a simple table

n	a(n)
0	1
1	0
2	0
3	6
4	48
5	480
6	6480
7	100800
8	1774080
9	35199360
10	776563200
11	18840729600
12	498640665600
13	14297239756800
14	441470866636800
15	14605415016192000
16	515412006100992000
17	19325209343311872000
18	767215648278503424000

[1,0,0,6,48,480,6480,100800,1774080,35199360, 776563200,18840729600,498640665600,14297239756800, 441470866636800,14605415016192000, 515412006100992000,19325209343311872000, 767215648278503424000]

[1,0,0,6,48,480,6480,100800,1774080,35199360,
 776563200,18840729600,498640665600,14297239756800,
 441470866636800,14605415016192000,
 515412006100992000,19325209343311872000,
 767215648278503424000]