A091788 - OEIS

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A091788 as a simple table

n	a(n)
1	1
2	2
3	2
4	4
5	16
6	96
7	5184
8	829440
9	1911029760
10	13002646487040
11	10065920762063093760
12	9319918463639717615448883200
13	137422208150223932126848386360776224407552000

[1,2,2,4,16,96,5184,829440,1911029760, 13002646487040,10065920762063093760, 9319918463639717615448883200, 137422208150223932126848386360776224407552000]