A052691 - OEIS

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A052691 as a simple table

n	a(n)
0	1
1	1
2	2
3	12
4	96
5	840
6	8640
7	105840
8	1491840
9	23587200
10	413683200
11	7983360000
12	168129561600
13	3835844812800
14	94239732787200
15	2480658276096000
16	69651967537152000
17	2077925954936832000
18	65637135231123456000

[1,1,2,12,96,840,8640,105840,1491840,23587200, 413683200,7983360000,168129561600,3835844812800, 94239732787200,2480658276096000,69651967537152000, 2077925954936832000,65637135231123456000]