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A266706 as a simple table

na(n)
11
2-23
3-45
4-135
5-337
6-899
7-2337
8-6135
9-16045
10-42023
11-110001
12-288003
13-753985
14-1973975
15-5167917
16-13529799
17-35421457
18-92734595
19-242782305
20-635612343
21-1664054701
22-4356551783
23-11405600625
24-29860250115
25-78175149697
26-204665198999

[1,-23,-45,-135,-337,-899,-2337,-6135,-16045,
 -42023,-110001,-288003,-753985,-1973975,-5167917,
 -13529799,-35421457,-92734595,-242782305,
 -635612343,-1664054701,-4356551783,-11405600625,
 -29860250115,-78175149697,-204665198999]