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A266718 as a simple table

na(n)
01
15
26
3123
412
52039
624
732751
848
9524255
1096
118388543
12192
13134217599
14384
152147483391
16768
1734359737855
181536
19549755812863
203072
218796093020159
226144
23140737488351231
2412288
252251799813677055
2624576
2736028797018947583
2849152
29576460752303390719
3098304

[1,5,6,123,12,2039,24,32751,48,524255,96,8388543,
 192,134217599,384,2147483391,768,34359737855,1536,
 549755812863,3072,8796093020159,6144,
 140737488351231,12288,2251799813677055,24576,
 36028797018947583,49152,576460752303390719,98304]