A322859 - OEIS

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A322859 as a simple table

n	a(n)
0	1
1	1
2	2
3	4
4	14
5	52
6	256
7	1396
8	9064
9	62420
10	500000
11	4250180
12	40738880
13	410140060
14	4572668112
15	53214384548
16	676739353112

[1,1,2,4,14,52,256,1396,9064,62420,500000,4250180, 40738880,410140060,4572668112,53214384548, 676739353112]