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A141140 as a simple table

na(n)
11
21
3-2
410
5-62
6466
7-4004
837774
9-383042
104120768
11-46601144
12550296628
13-6751738736
1485742962300
15-1123702072256
1615161509999324
17-210202294372118
182989858353554554
19-43572404751879032
20649889656256427742
21-9911173481433673436

[1,1,-2,10,-62,466,-4004,37774,-383042,4120768,
 -46601144,550296628,-6751738736,85742962300,
 -1123702072256,15161509999324,-210202294372118,
 2989858353554554,-43572404751879032,
 649889656256427742,-9911173481433673436]