A236111 - OEIS

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A236111 as a simple table

n	a(n)
1	1
2	2
3	6
4	15
5	30
6	210
7	462
8	1848
9	2310
10	9240
11	18480
12	55440
13	83160
14	166320
15	498960
16	2494800
17	17463600
18	331808400
19	4418290800

[1,2,6,15,30,210,462,1848,2310,9240,18480,55440, 83160,166320,498960,2494800,17463600,331808400, 4418290800]