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A139820 as a simple table

na(n)
01
1-8
232
3-96
4256
5-624
61408
7-3008
86144
9-12072
1022976
11-42528
1276800
13-135728
14235264
15-400704
16671744
17-1109904
181809568
19-2914272
204640256
21-7310592
2211404416
23-17626944
2427009024
25-41047992
2661905088
27-92681664
28137803776
29-203554224

[1,-8,32,-96,256,-624,1408,-3008,6144,-12072,
 22976,-42528,76800,-135728,235264,-400704,671744,
 -1109904,1809568,-2914272,4640256,-7310592,
 11404416,-17626944,27009024,-41047992,61905088,
 -92681664,137803776,-203554224]