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A108781 as a simple table

na(n)
01
11
25
39
45
5-7
65
773
869
9-295
10-571
111321
124613
13-4167
14-32635
15-1783
16211141
17200601
18-1229243
19-2468375
206117509
2122557305
22-21519611
23-176980023
24-13664955
251234115673
261250908869
27-7608051031
28-16094268667
2939424807225
30153179607429
31-139981878647
32-1243776268859

[1,1,5,9,5,-7,5,73,69,-295,-571,1321,4613,-4167,
 -32635,-1783,211141,200601,-1229243,-2468375,
 6117509,22557305,-21519611,-176980023,-13664955,
 1234115673,1250908869,-7608051031,-16094268667,
 39424807225,153179607429,-139981878647,
 -1243776268859]