A012269 - OEIS

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A012269 as a simple table

n	a(n)
0	0
1	0
2	2
3	-6
4	22
5	-100
6	308
7	1512
8	-51144
9	869472
10	-12406608
11	155319120
12	-1563312720
13	6008315040
14	296596492320
15	-12739805608320
16	357984190838400
17	-8317532611046400
18	160961311569285120
19	-2183410259228574720

[0,0,2,-6,22,-100,308,1512,-51144,869472, -12406608,155319120,-1563312720,6008315040, 296596492320,-12739805608320,357984190838400, -8317532611046400,160961311569285120, -2183410259228574720]