A013456 - OEIS

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A013456 as a simple table

n	a(n)
0	1
1	0
2	0
3	0
4	0
5	-8
6	0
7	-448
8	0
9	-32384
10	8064
11	-3275008
12	2838528
13	-456633344
14	863070208
15	-85339110400
16	280413765632
17	-20783183790080
18	103486230003712
19	-6429447050002432
20	44250652523855872

[1,0,0,0,0,-8,0,-448,0,-32384,8064,-3275008, 2838528,-456633344,863070208,-85339110400, 280413765632,-20783183790080,103486230003712, -6429447050002432,44250652523855872]