A013433 - OEIS

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A013433 as a simple table

n	a(n)
0	0
1	1
2	15
3	495
4	28735
5	2597175
6	337740975
7	59815330575
8	13857008709375
9	4071452200086375
10	1480690661198331375
11	653488912610356197375
12	344332933648569891309375
13	213657034023415650312084375

[0,1,15,495,28735,2597175,337740975,59815330575, 13857008709375,4071452200086375, 1480690661198331375,653488912610356197375, 344332933648569891309375, 213657034023415650312084375]