login

A009117 as a simple table

na(n)
01
1-2
28
3-32
4128
5-512
62048
7-8192
832768
9-131072
10524288
11-2097152
128388608
13-33554432
14134217728
15-536870912
162147483648
17-8589934592
1834359738368
19-137438953472
20549755813888
21-2199023255552
228796093022208
23-35184372088832
24140737488355328
25-562949953421312

[1,-2,8,-32,128,-512,2048,-8192,32768,-131072,
 524288,-2097152,8388608,-33554432,134217728,
 -536870912,2147483648,-8589934592,34359738368,
 -137438953472,549755813888,-2199023255552,
 8796093022208,-35184372088832,140737488355328,
 -562949953421312]