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A266324 as a simple table

na(n)
01
15
20
3127
40
52047
60
732767
80
9524287
100
118388607
120
13134217727
140
152147483647
160
1734359738367
180
19549755813887
200
218796093022207
220
23140737488355327
240
252251799813685247
260
2736028797018963967
280
29576460752303423487
300
319223372036854775807
320

[1,5,0,127,0,2047,0,32767,0,524287,0,8388607,0,
 134217727,0,2147483647,0,34359738367,0,
 549755813887,0,8796093022207,0,140737488355327,0,
 2251799813685247,0,36028797018963967,0,
 576460752303423487,0,9223372036854775807,0]