A088300 - OEIS

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A088300 as a simple table

n	a(n)
1	1
2	3
3	10
4	40
5	168
6	1008
7	7920
8	63360
9	570240
10	5080320
11	47174400
12	566092800
13	8143027200
14	114002380800
15	1710035712000
16	27360571392000
17	397533007872000
18	7155594141696000
19	147254595231744000
20	2945091904634880000

[1,3,10,40,168,1008,7920,63360,570240,5080320, 47174400,566092800,8143027200,114002380800, 1710035712000,27360571392000,397533007872000, 7155594141696000,147254595231744000, 2945091904634880000]