A052595 - OEIS

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A052595 as a simple table

n	a(n)
0	1
1	3
2	20
3	198
4	2616
5	43200
6	856080
7	19792080
8	522950400
9	15544690560
10	513406252800
11	18652322304000
12	739253228313600
13	31740638183654400
14	1467650891266560000
15	72709824125562624000
16	3842307771930980352000

[1,3,20,198,2616,43200,856080,19792080,522950400, 15544690560,513406252800,18652322304000, 739253228313600,31740638183654400, 1467650891266560000,72709824125562624000, 3842307771930980352000]