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A083581 as a simple table

na(n)
01
16
2-4
316
4-24
556
6-104
7216
8-424
9856
10-1704
113416
12-6824
1313656
14-27304
1554616
16-109224
17218456
18-436904
19873816
20-1747624
213495256
22-6990504
2313981016
24-27962024
2555924056
26-111848104
27223696216
28-447392424
29894784856
30-1789569704
313579139416
32-7158278824

[1,6,-4,16,-24,56,-104,216,-424,856,-1704,3416,
 -6824,13656,-27304,54616,-109224,218456,-436904,
 873816,-1747624,3495256,-6990504,13981016,
 -27962024,55924056,-111848104,223696216,
 -447392424,894784856,-1789569704,3579139416,
 -7158278824]