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A009718 as a simple table

na(n)
00
12
20
3-48
4896
5-1280
6-1317888
7113985536
8-5662048256
9-173996310528
10103038851481600
11-18151624725757952
121834297840675848192
1353334014587534573568
14-66117477689491873333248

[0,2,0,-48,896,-1280,-1317888,113985536,
 -5662048256,-173996310528,103038851481600,
 -18151624725757952,1834297840675848192,
 53334014587534573568,-66117477689491873333248]