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A176546 as a simple table

na(n)
01
11
21
3-1
41
5-1
65
7-691
87
9-3617
1043867
11-174611
12854513
13-236364091
148553103
15-23749461029
168615841276005
17-7709321041217
182577687858367
19-26315271553053477373
202929993913841559
21-261082718496449122051

[1,1,1,-1,1,-1,5,-691,7,-3617,43867,-174611,
 854513,-236364091,8553103,-23749461029,
 8615841276005,-7709321041217,2577687858367,
 -26315271553053477373,2929993913841559,
 -261082718496449122051]