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A266671 as a simple table

na(n)
01
13
28
395
464
51791
6512
730719
84096
9507903
1032768
118257535
12262144
13133169151
142097152
152139095039
1616777216
1734292629503
18134217728
19549218942975
201073741824
218791798054911
228589934592
23140703128616959
2468719476736
252251524935778303
26549755813888

[1,3,8,95,64,1791,512,30719,4096,507903,32768,
 8257535,262144,133169151,2097152,2139095039,
 16777216,34292629503,134217728,549218942975,
 1073741824,8791798054911,8589934592,
 140703128616959,68719476736,2251524935778303,
 549755813888]