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A099324 as a simple table

na(n)
01
10
2-1
33
4-8
522
6-64
7196
8-625
92055
10-6917
1123713
12-82499
13290511
14-1033411
153707851
16-13402696
1748760366
18-178405156
19656043856
20-2423307046
218987427466
22-33453694486
23124936258126
24-467995871776
251757900019100
26-6619846420552
2724987199492704
28-94520750408708

[1,0,-1,3,-8,22,-64,196,-625,2055,-6917,23713,
 -82499,290511,-1033411,3707851,-13402696,48760366,
 -178405156,656043856,-2423307046,8987427466,
 -33453694486,124936258126,-467995871776,
 1757900019100,-6619846420552,24987199492704,
 -94520750408708]