A013461 - OEIS

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A013461 as a simple table

n	a(n)
0	1
1	0
2	0
3	-1
4	0
5	15
6	10
7	-495
8	-840
9	29015
10	87750
11	-2666475
12	-12310100
13	354343275
14	2287605450
15	-64350661375
16	-549013374000
17	15319760415375
18	166031512396750
19	-4630895520073875
20	-61922192590147500

[1,0,0,-1,0,15,10,-495,-840,29015,87750,-2666475, -12310100,354343275,2287605450,-64350661375, -549013374000,15319760415375,166031512396750, -4630895520073875,-61922192590147500]