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A009601 as a simple table

na(n)
00
11
2-1
35
4-24
5166
6-1350
713026
8-143808
91790560
10-24782400
11377280056
12-6262125936
13112504698840
14-2174463129384
1544977635083096
16-991157036904960
1723178047520065536
18-573180268144301568
1914943307041391438080

[0,1,-1,5,-24,166,-1350,13026,-143808,1790560,
 -24782400,377280056,-6262125936,112504698840,
 -2174463129384,44977635083096,-991157036904960,
 23178047520065536,-573180268144301568,
 14943307041391438080]