A015507 - OEIS

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A015507 as a simple table

n	a(n)
1	1
2	1
3	8
4	352
5	91520
6	142405120
7	1328924579840
8	74403829376081920
9	24994031979330942894080
10	50376471215620688640734003200
11	609214555257707874214915513922355200
12	44204249911340791820804231319883906967142400

[1,1,8,352,91520,142405120,1328924579840, 74403829376081920,24994031979330942894080, 50376471215620688640734003200, 609214555257707874214915513922355200, 44204249911340791820804231319883906967142400]