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A112113 as a simple table

na(n)
11
21
3-4
428
5-236
62159
7-20309
8189387
9-1696165
1014092143
11-103605487
12621674576
13-2503235595
141311059747
1558857366823
16-625935119621
1720416246154579
18-595556154741631
199331660766550500
20-50486760747953952
21-816026626910008666

[1,1,-4,28,-236,2159,-20309,189387,-1696165,
 14092143,-103605487,621674576,-2503235595,
 1311059747,58857366823,-625935119621,
 20416246154579,-595556154741631,9331660766550500,
 -50486760747953952,-816026626910008666]