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A015268 as a simple table

na(n)
31
4-20
5610
6-15860
7433771
8-11662040
9315323620
10-8509702520
11229798289941
12-6204226946060
13167517069529030
14-4522934399547980
15122119467087816511
16-3297223466672052080
1789025052902439936840
18-2403676254645238280240

[1,-20,610,-15860,433771,-11662040,315323620,
 -8509702520,229798289941,-6204226946060,
 167517069529030,-4522934399547980,
 122119467087816511,-3297223466672052080,
 89025052902439936840,-2403676254645238280240]