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A158981 as a simple table

na(n)
01
14
2-82
3-1112
419660
5514544
6-7575224
7-332852768
83865192592
9276417340480
10-2303430504224
11-280102715687296
121362687220804288
13334851542531477248
14-396657349178753920
15-461002945749901799936
16-1260925479706838937344
17717808917017018666550272

[1,4,-82,-1112,19660,514544,-7575224,-332852768,
 3865192592,276417340480,-2303430504224,
 -280102715687296,1362687220804288,
 334851542531477248,-396657349178753920,
 -461002945749901799936,-1260925479706838937344,
 717808917017018666550272]