A142987 - OEIS

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A142987 as a simple table

n	a(n)
1	1
2	10
3	106
4	1180
5	13920
6	174600
7	2330640
8	33084000
9	498646080
10	7964020800
11	134491276800
12	2396163513600
13	44942274316800
14	885524502643200
15	18293122632960000
16	395457106963968000
17	8930300425804800000

[1,10,106,1180,13920,174600,2330640,33084000, 498646080,7964020800,134491276800,2396163513600, 44942274316800,885524502643200,18293122632960000, 395457106963968000,8930300425804800000]