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A271977 as a simple table

na(n)
30
4139
51751
6187243
716777215
833554571
950333399
1084073323
11134217727
12134217867
13134219479
14134404971
15150994943

[0,139,1751,187243,16777215,33554571,50333399,
 84073323,134217727,134217867,134219479,134404971,
 150994943]