A000315 - OEIS

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A000315 as a simple table

n	a(n)
1	1
2	1
3	1
4	4
5	56
6	9408
7	16942080
8	535281401856
9	377597570964258816
10	7580721483160132811489280
11	5363937773277371298119673540771840

[1,1,1,4,56,9408,16942080,535281401856, 377597570964258816,7580721483160132811489280, 5363937773277371298119673540771840]