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A296979 as a simple table

na(n)
00
11
2-1
33
4-12
568
6-480
74144
8-42112
9494360
10-6581880
1198079696
12-1617373296
1329245459176
14-575367843960
1512235339942344
16-279650131845120
176836254328079936
18-177979145883651648
194916243253642325056
20-143602294106947553280
214422411460743707222784

[0,1,-1,3,-12,68,-480,4144,-42112,494360,-6581880,
 98079696,-1617373296,29245459176,-575367843960,
 12235339942344,-279650131845120,6836254328079936,
 -177979145883651648,4916243253642325056,
 -143602294106947553280,4422411460743707222784]