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A255526 as a simple table

na(n)
1-1
21
3-4
417
5-56
6172
7-547
81809
9-6061
1020316
11-68135
12229244
13-774372
142624119
15-8912759
1630328593
17-103382254
18352975681
19-1206921212
204132159452
21-14163858895
2248601267199
23-166930975524
24573872089212
25-1974472043081
266798561779868
27-23425506369715

[-1,1,-4,17,-56,172,-547,1809,-6061,20316,-68135,
 229244,-774372,2624119,-8912759,30328593,
 -103382254,352975681,-1206921212,4132159452,
 -14163858895,48601267199,-166930975524,
 573872089212,-1974472043081,6798561779868,
 -23425506369715]