A090962 - OEIS

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A090962 as a simple table

n	a(n)
1	1
2	8
3	207
4	40
5	7520
6	38880
7	2050496
8	14680064
9	983222784
10	9000000000
11	733008370688
12	8173092077568
13	784798672805888
14	10318292052303872
15	1141809497781288960
16	1025031833202524160
17	2183733606400887160832

[1,8,207,40,7520,38880,2050496,14680064,983222784, 9000000000,733008370688,8173092077568, 784798672805888,10318292052303872, 1141809497781288960,1025031833202524160, 2183733606400887160832]