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A325668 as a simple table

na(n)
12
20
30
40
51
6-5
715
8-35
971
10-135
11255
12-495
13991
14-2015
154095
16-8255
1716511
18-32895
1965535
20-130815
21261630
22-523753
231048322
24-2096151
254183700
26-8324849
2716480854
28-32363019
2962784774
30-119759849
31223346544
32-404491999
33705032194
34-1166803109

[2,0,0,0,1,-5,15,-35,71,-135,255,-495,991,-2015,
 4095,-8255,16511,-32895,65535,-130815,261630,
 -523753,1048322,-2096151,4183700,-8324849,
 16480854,-32363019,62784774,-119759849,223346544,
 -404491999,705032194,-1166803109]