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A296048 as a simple table

na(n)
01
1-2
22
3-4
432
5-128
6496
7-2336
829312
9-395776
103194624
11-21951488
12277270528
13-4027191296
1438850203648
15-739834458112
1619460560584704
17-299971773661184
183169121209090048
19-51853341314514944
201234704403684130816
21-30653318499154788352
22658369600764729884672
23-10809496145754051313664

[1,-2,2,-4,32,-128,496,-2336,29312,-395776,
 3194624,-21951488,277270528,-4027191296,
 38850203648,-739834458112,19460560584704,
 -299971773661184,3169121209090048,
 -51853341314514944,1234704403684130816,
 -30653318499154788352,658369600764729884672,
 -10809496145754051313664]