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A137784 as a simple table

na(n)
12
2-3
318
4-44
5-72
6216
7360
8-1980
9-1620
103240
117176
1225920
13-71280
14-38880
1558320
16-151200
17753480
181360800
19-2494800
20-1020600
211224720
22-3587520
23-21772800
2454250560
2565318400
26-89812800
27-29393280
2829393280
29152409600
30-678041280
31-2057529600
323417785280
333086294400

[2,-3,18,-44,-72,216,360,-1980,-1620,3240,7176,
 25920,-71280,-38880,58320,-151200,753480,1360800,
 -2494800,-1020600,1224720,-3587520,-21772800,
 54250560,65318400,-89812800,-29393280,29393280,
 152409600,-678041280,-2057529600,3417785280,
 3086294400]