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A055139 as a simple table

na(n)
01
1-1
20
31
4-1
5-1
64
7-1
8-19
931
10120
11-483
12-933
138623
146748
15-189589
1641561
175147391
18-6328400
19-170622599
20394612599
216807529823
22-23890335372
23-322371010985
241564733285829
2517884889743135
26-114158790326872

[1,-1,0,1,-1,-1,4,-1,-19,31,120,-483,-933,8623,
 6748,-189589,41561,5147391,-6328400,-170622599,
 394612599,6807529823,-23890335372,-322371010985,
 1564733285829,17884889743135,-114158790326872]