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A060239 as a simple table

na(n)
11
2-1
34
4-8
5128
6512
7-18432
873728
9-884736
10-14155776
111415577600
1211324620800
13-1630745395200
14-58706834227200
15-3757237390540800
1630057899124326400
17-7694822175827558400
18-92337866109930700800

[1,-1,4,-8,128,512,-18432,73728,-884736,-14155776,
 1415577600,11324620800,-1630745395200,
 -58706834227200,-3757237390540800,
 30057899124326400,-7694822175827558400,
 -92337866109930700800]