A012352 - OEIS

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A012352 as a simple table

n	a(n)
0	0
1	0
2	2
3	-3
4	16
5	-50
6	200
7	-336
8	-6064
9	116712
10	-1823552
11	24444200
12	-343290400
13	4725483984
14	-68637208848
15	1009375584840
16	-15551178814464
17	244877850035008
18	-4005060390790656
19	66944176204337280

[0,0,2,-3,16,-50,200,-336,-6064,116712,-1823552, 24444200,-343290400,4725483984,-68637208848, 1009375584840,-15551178814464,244877850035008, -4005060390790656,66944176204337280]