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A294293 as a simple table

na(n)
01
1-1
21
3-7
449
5-301
63001
7-26251
8280897
9-4040569
1052124401
11-749335951
1212646748401
13-215856019237
144053285942889
15-82462867482451
161728838444704001
17-38850070313151601
18922947645744036577
19-22864122050534606359
20599150979583749111601

[1,-1,1,-7,49,-301,3001,-26251,280897,-4040569,
 52124401,-749335951,12646748401,-215856019237,
 4053285942889,-82462867482451,1728838444704001,
 -38850070313151601,922947645744036577,
 -22864122050534606359,599150979583749111601]