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A120362 as a simple table

na(n)
11
20
3-1
40
54
6-3
70
8-16
960
10-45
110
1264
13-1008
142520
15-1575
160
17-256
1816320
19-105840
20189000
21-99225
220
231024
24-261888
254055040
26-15800400
2721829500
28-9823275
290
30-4096
314193280
32-149909760
331153152000
34-3178375200
353575672100
36-1404728325
370
3816384
39-67104768
405459650560

[1,0,-1,0,4,-3,0,-16,60,-45,0,64,-1008,2520,-1575,
 0,-256,16320,-105840,189000,-99225,0,1024,-261888,
 4055040,-15800400,21829500,-9823275,0,-4096,
 4193280,-149909760,1153152000,-3178375200,
 3575672100,-1404728325,0,16384,-67104768,
 5459650560]