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A161202 as a simple table

na(n)
01
1-5
215
3-5
4-5
5-3
6-5
7-5
8-45
9-55
10-143
11-195
12-1105
13-1615
14-4845
15-7429
16-185725
17-294975
18-950475
19-1550775
20-10235115
21-17058525
22-57378675
23-97294275
24-1329688425
25-2287064091
26-7916760315
27-13781027215

[1,-5,15,-5,-5,-3,-5,-5,-45,-55,-143,-195,-1105,
 -1615,-4845,-7429,-185725,-294975,-950475,
 -1550775,-10235115,-17058525,-57378675,-97294275,
 -1329688425,-2287064091,-7916760315,-13781027215]