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A117338 as a simple table

na(n)
01
12
21
34
4-9
562
6-399
73048
8-26045
9247298
10-2582027
1129416876
12-363327081
134837734374
14-69105690039
151054490587824
16-17122237729589
17294828907099274
18-5366869867749347
19102988994579465716
20-2078107926978317889
2143988545301378533742

[1,2,1,4,-9,62,-399,3048,-26045,247298,-2582027,
 29416876,-363327081,4837734374,-69105690039,
 1054490587824,-17122237729589,294828907099274,
 -5366869867749347,102988994579465716,
 -2078107926978317889,43988545301378533742]