A009343 - OEIS

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A009343 as a simple table

n	a(n)
0	0
1	1
2	-3
3	10
4	-50
5	340
6	-2888
7	29440
8	-350160
9	4759760
10	-72787488
11	1236761920
12	-23115758720
13	471323145280
14	-10410977045888
15	247656022739200
16	-6312036805140480
17	171600628707334400
18	-4956751714926617088

[0,1,-3,10,-50,340,-2888,29440,-350160,4759760, -72787488,1236761920,-23115758720,471323145280, -10410977045888,247656022739200,-6312036805140480, 171600628707334400,-4956751714926617088]