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A266461 as a simple table

na(n)
01
15
22
3123
44
52039
68
732751
816
9524255
1032
118388543
1264
13134217599
14128
152147483391
16256
1734359737855
18512
19549755812863
201024
218796093020159
222048
23140737488351231
244096
252251799813677055
268192
2736028797018947583
2816384
29576460752303390719
3032768

[1,5,2,123,4,2039,8,32751,16,524255,32,8388543,64,
 134217599,128,2147483391,256,34359737855,512,
 549755812863,1024,8796093020159,2048,
 140737488351231,4096,2251799813677055,8192,
 36028797018947583,16384,576460752303390719,32768]