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A120556 as a simple table

na(n)
12
20
30
416
52
60
776
832
9-14
10308
11208
12-76
131066
141068
15-342
163296
174718
18-1148
199210
2018360
21-2916
2222240
2367768
24-3068
2543602
26224552
2726236
2839276
29745788
30190484
31-155664
322127756
331279618
34-1371720
356320170
364921464
37-5606788

[2,0,0,16,2,0,76,32,-14,308,208,-76,1066,1068,
 -342,3296,4718,-1148,9210,18360,-2916,22240,67768,
 -3068,43602,224552,26236,39276,745788,190484,
 -155664,2127756,1279618,-1371720,6320170,4921464,
 -5606788]