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A081294 as a simple table

na(n)
01
12
28
332
4128
5512
62048
78192
832768
9131072
10524288
112097152
128388608
1333554432
14134217728
15536870912
162147483648
178589934592
1834359738368
19137438953472
20549755813888
212199023255552
228796093022208
2335184372088832

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