A067515 - OEIS

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A067515 as a simple table

n	a(n)
1	0
2	1
3	5
4	55
5	1346269
6	9227465
7	4052739537881
8	498454011879264
9	1672445759041379840132227567949787325
10	18547707689471986212190138521399707760
11	619220451666590135228675387863297874269396512

[0,1,5,55,1346269,9227465,4052739537881, 498454011879264, 1672445759041379840132227567949787325, 18547707689471986212190138521399707760, 619220451666590135228675387863297874269396512]