A015337 - OEIS

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A015337 as a simple table

n	a(n)
6	1
7	4482037
8	21762709934980
9	104996653267533662740
10	506816536013640476467362442
11	2446300028783605805772822454177234
12	11807825441932996339362317150047214843540

[1,4482037,21762709934980,104996653267533662740, 506816536013640476467362442, 2446300028783605805772822454177234, 11807825441932996339362317150047214843540]