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A249789 as a simple table

na(n)
01
11
2-3
39
4-87
5705
6-10395
7144585
8-2851695
956867265
10-1413148275
1136699287625
12-1106370671175
1335311847796225
14-1256361047016075
1547461118535455625
16-1950838291460433375
1784992806074321770625
18-3968100259495356859875
19195665521053499007135625

[1,1,-3,9,-87,705,-10395,144585,-2851695,56867265,
 -1413148275,36699287625,-1106370671175,
 35311847796225,-1256361047016075,
 47461118535455625,-1950838291460433375,
 84992806074321770625,-3968100259495356859875,
 195665521053499007135625]