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A104031 as a simple table

na(n)
01
1-5
232
3-299
44015
5-74080
61801537
7-55855829
82150565968
9-100668835739
105630336915071
11-370807060847872
1228403381397111649
13-2503741873703550533
14251652633457563092096
15-28608467296650576313259
163652291148549164761101551
17-520296573821474451201241696

[1,-5,32,-299,4015,-74080,1801537,-55855829,
 2150565968,-100668835739,5630336915071,
 -370807060847872,28403381397111649,
 -2503741873703550533,251652633457563092096,
 -28608467296650576313259,
 3652291148549164761101551,
 -520296573821474451201241696]