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A055634 as a simple table

na(n)
01
1-1
21
3-3
43
5-15
615
7-105
8105
9-945
10945
11-10395
1210395
13-135135
14135135
15-2027025
162027025
17-34459425
1834459425
19-654729075
20654729075
21-13749310575
2213749310575
23-316234143225
24316234143225
25-7905853580625
267905853580625
27-213458046676875
28213458046676875

[1,-1,1,-3,3,-15,15,-105,105,-945,945,-10395,
 10395,-135135,135135,-2027025,2027025,-34459425,
 34459425,-654729075,654729075,-13749310575,
 13749310575,-316234143225,316234143225,
 -7905853580625,7905853580625,-213458046676875,
 213458046676875]