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A101908 as a simple table

na(n)
11
2-1
31
4-3
52
61
7-8
817
9-10
101
11-23
12137
13-265
14150
151
16-75
171333
18-7389
1913930
20-7800
211
22-278
2316558
24-277988
251513897
26-2835590
271583400
281
29-1155
30260364
31-14799354
32245309373
33-1330523259
342488395830
35-1388641800
361
37-5295
385042064
39-1092706314
4061514634933
41-1016911327479

[1,-1,1,-3,2,1,-8,17,-10,1,-23,137,-265,150,1,-75,
 1333,-7389,13930,-7800,1,-278,16558,-277988,
 1513897,-2835590,1583400,1,-1155,260364,-14799354,
 245309373,-1330523259,2488395830,-1388641800,1,
 -5295,5042064,-1092706314,61514634933,
 -1016911327479]