A123281 - OEIS

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A123281 as a simple table

n	a(n)
1	1
2	1
3	1
4	5
5	19
6	205
7	1795
8	36317
9	636331
10	23679901
11	805351531
12	56294206205
13	3735873535339
14	502757743028605
15	65725984337422795
16	17309316971673776957
17	4485620580863732681131

[1,1,1,5,19,205,1795,36317,636331,23679901, 805351531,56294206205,3735873535339, 502757743028605,65725984337422795, 17309316971673776957,4485620580863732681131]