A013242 - OEIS

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A013242 as a simple table

n	a(n)
0	0
1	0
2	-1
3	0
4	-6
5	8
6	-150
7	448
8	-7560
9	38432
10	-650160
11	4827328
12	-85887648
13	855019904
14	-16230758544
15	204362847232
16	-4163699379840
17	63548399361536
18	-1392682970270592
19	24960951809133568
20	-588583828329908480

[0,0,-1,0,-6,8,-150,448,-7560,38432,-650160, 4827328,-85887648,855019904,-16230758544, 204362847232,-4163699379840,63548399361536, -1392682970270592,24960951809133568, -588583828329908480]