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A306941 as a simple table

na(n)
01
18
236
3120
4330
5792
61716
73432
86434
911424
1019312
1131008
1246512
1362016
1462016
150
16-245156
17-961376
18-2787760
19-7065760
20-16478280
21-36159840
22-75522960
23-151045920
24-290021896
25-534308096
26-940325760
27-1564496128
28-2406819200
29-3249142272
30-3249142272

[1,8,36,120,330,792,1716,3432,6434,11424,19312,
 31008,46512,62016,62016,0,-245156,-961376,
 -2787760,-7065760,-16478280,-36159840,-75522960,
 -151045920,-290021896,-534308096,-940325760,
 -1564496128,-2406819200,-3249142272,-3249142272]