A157599 - OEIS

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A157599 as a simple table

n	a(n)
2	1
3	9
4	402
5	44230
6	4512465
7	423267831
8	37803628716
9	3527887213476
10	318332583745245
11	25647872392849575
12	1892012326768856754
13	131465592083214083058
14	8752726227773492626389
15	563521423775802944905950

[1,9,402,44230,4512465,423267831,37803628716, 3527887213476,318332583745245,25647872392849575, 1892012326768856754,131465592083214083058, 8752726227773492626389,563521423775802944905950]