A137437 - OEIS

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A137437 as a simple table

n	a(n)
1	1
2	0
3	0
4	0
5	-2
6	0
7	6
8	0
9	-24
10	0
11	120
12	40
13	0
14	-720
15	-420
16	0
17	5040
18	3948
19	0
20	-40320
21	-38304
22	-2240
23	0
24	362880
25	396576
26	50400

[1,0,0,0,-2,0,6,0,-24,0,120,40,0,-720,-420,0,5040, 3948,0,-40320,-38304,-2240,0,362880,396576,50400]