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A308024 as a simple table

na(n)
11
21
30
4-2
54
60
7-24
868
920
10-936
113800
12-2172
13-64120
14417752
15-959852
16-5464092
1768816400
18-328509112
198361828
2013473157664
21-119068537700
22448312242012
231868795480588
24-43889516937276
25348963546501928
26-1006637409183472
27-12316833304447344
28217304253286437480

[1,1,0,-2,4,0,-24,68,20,-936,3800,-2172,-64120,
 417752,-959852,-5464092,68816400,-328509112,
 8361828,13473157664,-119068537700,448312242012,
 1868795480588,-43889516937276,348963546501928,
 -1006637409183472,-12316833304447344,
 217304253286437480]