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A009343 as a simple table

na(n)
00
11
2-3
310
4-50
5340
6-2888
729440
8-350160
94759760
10-72787488
111236761920
12-23115758720
13471323145280
14-10410977045888
15247656022739200
16-6312036805140480
17171600628707334400
18-4956751714926617088

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