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A260780 as a simple table

na(n)
01
13
2-1
323
4-16
55
6165
7-177
8111
9-27
103802
11-5548
125232
13-2548
14502
1521385
16-39615
1749910
18-36490
1914385
20-2375
21993605
22-2235440
233527745
24-3441280
252035695
26-672360
2795435

[1,3,-1,23,-16,5,165,-177,111,-27,3802,-5548,5232,
 -2548,502,21385,-39615,49910,-36490,14385,-2375,
 993605,-2235440,3527745,-3441280,2035695,-672360,
 95435]