A287377 - OEIS

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A287377 as a simple table

n	a(n)
0	1
1	1
2	1
3	1
4	1
5	1
6	1
7	1
8	1
9	22680
10	1
11	1
12	5040
13	3742560
14	4540536000
15	1
16	1
17	113400
18	851370480
19	6518191680000
20	54111175679736000

[1,1,1,1,1,1,1,1,1,22680,1,1,5040,3742560, 4540536000,1,1,113400,851370480,6518191680000, 54111175679736000]