A075533 - OEIS

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A075533 as a simple table

n	a(n)
1	1
2	2
3	0
4	12
5	0
6	0
7	840
8	0
9	0
10	50400
11	831600
12	0
13	0
14	302702400
15	1135134000
16	14529715200
17	0
18	2315673360000
19	15545887156800
20	140792940288000
21	443497761907200
22	28006062372288000
23	623360743125120000

[1,2,0,12,0,0,840,0,0,50400,831600,0,0,302702400, 1135134000,14529715200,0,2315673360000, 15545887156800,140792940288000,443497761907200, 28006062372288000,623360743125120000]