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A009065 as a simple table

na(n)
01
10
2-1
33
4-18
5120
6-966
78946
8-93748
91094832
10-14078036
11197375420
12-2992213584
1348700300272
14-845573085072
1515571699693200
16-302493769715504
176165508375224704
18-131129003401938832
192892534929270217648

[1,0,-1,3,-18,120,-966,8946,-93748,1094832,
 -14078036,197375420,-2992213584,48700300272,
 -845573085072,15571699693200,-302493769715504,
 6165508375224704,-131129003401938832,
 2892534929270217648]