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A326481 as a simple table

na(n)
01
1-2
22
34
4-16
5-32
6272
7544
8-7936
9-15872
10353792
11707584
12-22368256
13-44736512
141903757312
153807514624
16-209865342976
17-419730685952
1829088885112832
1958177770225664
20-4951498053124096
21-9902996106248192
221015423886506852352

[1,-2,2,4,-16,-32,272,544,-7936,-15872,353792,
 707584,-22368256,-44736512,1903757312,3807514624,
 -209865342976,-419730685952,29088885112832,
 58177770225664,-4951498053124096,
 -9902996106248192,1015423886506852352]