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A126986 as a simple table

na(n)
01
1-4
212
3-40
4124
5-408
61272
7-4176
813020
9-42808
10133096
11-439344
121358872
13-4514800
1413853040
15-46469280
16140945820
17-479312760
181430085000
19-4958382960
2014453014920
21-51500944080
22145230007440
23-537922074720
241446902948184
25-5662012752048
2614228883685392

[1,-4,12,-40,124,-408,1272,-4176,13020,-42808,
 133096,-439344,1358872,-4514800,13853040,
 -46469280,140945820,-479312760,1430085000,
 -4958382960,14453014920,-51500944080,145230007440,
 -537922074720,1446902948184,-5662012752048,
 14228883685392]