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A196958 as a simple table

na(n)
01
11
2-3
322
4-227
52571
6-19157
7-550675
847287609
9-2474401796
10113036728791
11-4672627704315
12162246902824213
13-2986895872839215
14-218043087879704765
1536487218926663045686
16-3474880515053581779215
17262843589524537015935667
18-15730145172651453469201745
19541394288749029235105442821

[1,1,-3,22,-227,2571,-19157,-550675,47287609,
 -2474401796,113036728791,-4672627704315,
 162246902824213,-2986895872839215,
 -218043087879704765,36487218926663045686,
 -3474880515053581779215,262843589524537015935667,
 -15730145172651453469201745,
 541394288749029235105442821]