A122763 - OEIS

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A122763 as a simple table

n	a(n)
1	0
2	1
3	2
4	6
5	30
6	150
7	210
8	13860
9	60060
10	420420
11	4144140
12	9699690
13	87297210
14	717777060
15	4180566390
16	18846497670
17	26004868890

[0,1,2,6,30,150,210,13860,60060,420420,4144140, 9699690,87297210,717777060,4180566390,18846497670, 26004868890]