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A371688 as a simple table

na(n)
01
1-1
23
35
4-50
525
6-61
71281
8-2135
9427
101385
11-49860
12174510
13-116340
1412465
15-50521
162778655
17-16671930
1823340702
19-8335965
20555731
212702765
22-210815670
231932476975
24-4637944740
253478458555
26-772990790
2735135945

[1,-1,3,5,-50,25,-61,1281,-2135,427,1385,-49860,
 174510,-116340,12465,-50521,2778655,-16671930,
 23340702,-8335965,555731,2702765,-210815670,
 1932476975,-4637944740,3478458555,-772990790,
 35135945]