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A266709 as a simple table

na(n)
0-7
1-25
2-59
3-161
4-415
5-1093
6-2855
7-7481
8-19579
9-51265
10-134207
11-351365
12-919879
13-2408281
14-6304955
15-16506593
16-43214815
17-113137861
18-296198759
19-775458425
20-2030176507
21-5315071105
22-13915036799
23-36430039301
24-95375081095
25-249695203993

[-7,-25,-59,-161,-415,-1093,-2855,-7481,-19579,
 -51265,-134207,-351365,-919879,-2408281,-6304955,
 -16506593,-43214815,-113137861,-296198759,
 -775458425,-2030176507,-5315071105,-13915036799,
 -36430039301,-95375081095,-249695203993]