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A175722 as a simple table

na(n)
01
1-1
24
3-6
414
5-24
647
7-83
8152
9-268
10476
11-832
121453
13-2517
144348
15-7474
1612810
17-21880
1837275
19-63335
20107376
21-181656
22306744
23-517056
24870169
25-1462249
262453812
27-4112478
286884102
29-11510808
3019226951
31-32084027
3253489288
33-89097892
34148290068

[1,-1,4,-6,14,-24,47,-83,152,-268,476,-832,1453,
 -2517,4348,-7474,12810,-21880,37275,-63335,107376,
 -181656,306744,-517056,870169,-1462249,2453812,
 -4112478,6884102,-11510808,19226951,-32084027,
 53489288,-89097892,148290068]