A111814 - OEIS

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A111814 as a simple table

n	a(n)
0	0
1	1
2	0
3	-2
4	0
5	216
6	0
7	-568464
8	0
9	36058658688
10	0
11	-53694310935340800
12	0
13	1790669979087018171448320
14	0
15	-1280832788659041410080025283840000
16	0
17	18961468161294510864200732026858464699187200
18	0

[0,1,0,-2,0,216,0,-568464,0,36058658688,0, -53694310935340800,0,1790669979087018171448320,0, -1280832788659041410080025283840000,0, 18961468161294510864200732026858464699187200,0]