A009362 - OEIS

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A009362 as a simple table

n	a(n)
0	0
1	1
2	-3
3	12
4	-66
5	480
6	-4368
7	47712
8	-608016
9	8855040
10	-145083648
11	2641216512
12	-52891055616
13	1155444326400
14	-27344999497728
15	696933753434112
16	-19031293222127616
17	554336947975618560
18	-17155693983744196608

[0,1,-3,12,-66,480,-4368,47712,-608016,8855040, -145083648,2641216512,-52891055616,1155444326400, -27344999497728,696933753434112, -19031293222127616,554336947975618560, -17155693983744196608]