A145757 - OEIS

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A145757 as a simple table

n	a(n)
1	1
2	1
3	9
4	45
5	476
6	6933
7	199238
8	8764691
9	657200985
10	80295518797
11	16444907566268
12	5549422397331424
13	3112070848837147326

[1,1,9,45,476,6933,199238,8764691,657200985, 80295518797,16444907566268,5549422397331424, 3112070848837147326]