A114779 - OEIS

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A114779 as a simple table

n	a(n)
0	1
1	1
2	2
3	6
4	24
5	120
6	1440
7	30240
8	967680
9	43545600
10	5225472000
11	1207084032000
12	463520268288000
13	271159356948480000
14	455547719673446400000
15	1578472848668491776000000
16	9698137182219213471744000000

[1,1,2,6,24,120,1440,30240,967680,43545600, 5225472000,1207084032000,463520268288000, 271159356948480000,455547719673446400000, 1578472848668491776000000, 9698137182219213471744000000]