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A156088 as a simple table

na(n)
00
1-1
28
3-56
4385
5-2640
618096
7-124033
8850136
9-5826920
1039938305
11-273741216
121876250208
13-12860010241
1488143821480
15-604146740120
164140883359361
17-28382036775408
18194533374068496
19-1333351581704065
209138927697859960

[0,-1,8,-56,385,-2640,18096,-124033,850136,
 -5826920,39938305,-273741216,1876250208,
 -12860010241,88143821480,-604146740120,
 4140883359361,-28382036775408,194533374068496,
 -1333351581704065,9138927697859960]