A189859 - OEIS

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A189859 as a simple table

n	a(n)
1	1
2	2
3	6
4	24
5	120
6	464
7	2274
8	13236
9	91760
10	740562
11	5305548
12	43237840
13	395858894
14	4087066620
15	46633569480
16	509698057110

[1,2,6,24,120,464,2274,13236,91760,740562,5305548, 43237840,395858894,4087066620,46633569480, 509698057110]