A009763 - OEIS

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A009763 as a simple table

n	a(n)
0	1
1	1
2	6
3	76
4	1620
5	51780
6	2310000
7	136898496
8	10393064640
9	982930939200
10	113269208976000
11	15619762139984640
12	2539231615282602240
13	480507998223110457600
14	104704722014993388288000

[1,1,6,76,1620,51780,2310000,136898496, 10393064640,982930939200,113269208976000, 15619762139984640,2539231615282602240, 480507998223110457600,104704722014993388288000]