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A122112 as a simple table

na(n)
01
1-2
26
3-14
438
5-94
6246
7-622
81606
9-4094
1010518
11-26894
1268966
13-176542
14452406
15-1158574
162968198
17-7602494
1819475286
19-49885262
20127786406
21-327327454
22838473078
23-2147782894
245501675206
25-14092806782
2636099507606
27-92470734734

[1,-2,6,-14,38,-94,246,-622,1606,-4094,10518,
 -26894,68966,-176542,452406,-1158574,2968198,
 -7602494,19475286,-49885262,127786406,-327327454,
 838473078,-2147782894,5501675206,-14092806782,
 36099507606,-92470734734]