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A015013 as a simple table

na(n)
11
2-1
3-3
415
5165
6-3465
7-148995
812664575
92165642325
10-738484032825
11-504384594419475
12688484971382583375
131880252456845835197125
14-10268058666835106011499625
15-112158004817839862963610403875

[1,-1,-3,15,165,-3465,-148995,12664575,2165642325,
 -738484032825,-504384594419475,688484971382583375,
 1880252456845835197125,
 -10268058666835106011499625,
 -112158004817839862963610403875]