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A168589 as a simple table

na(n)
01
11
2-7
325
4-79
5241
6-727
72185
8-6559
919681
10-59047
11177145
12-531439
131594321
14-4782967
1514348905
16-43046719
17129140161
18-387420487
191162261465
20-3486784399
2110460353201
22-31381059607
2394143178825
24-282429536479

[1,1,-7,25,-79,241,-727,2185,-6559,19681,-59047,
 177145,-531439,1594321,-4782967,14348905,
 -43046719,129140161,-387420487,1162261465,
 -3486784399,10460353201,-31381059607,94143178825,
 -282429536479]