A052108 - OEIS

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A052108 as a simple table

n	a(n)
1	1
2	0
3	0
4	9
5	54
6	0
7	0
8	52650
9	1890540
10	0
11	0
12	264480947280
13	57127543673760
14	0
15	0
16	1295355012667626301200
17	1678780080964997690732640
18	0
19	0
20	6577809875294796334824189267538944

[1,0,0,9,54,0,0,52650,1890540,0,0,264480947280, 57127543673760,0,0,1295355012667626301200, 1678780080964997690732640,0,0, 6577809875294796334824189267538944]