A192897 - OEIS

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A192897 as a simple table

n	a(n)
1	0
2	1
3	1
4	7
5	48
6	699
7	17980
8	799894
9	63066784
10	8698226988
11	2104632006998
12	892430799525618
13	663245471214514116
14	863873891464881656064

[0,1,1,7,48,699,17980,799894,63066784,8698226988, 2104632006998,892430799525618,663245471214514116, 863873891464881656064]