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A152953 as a simple table

na(n)
16
228
3496
48128
533550336
68589869056
7137438691328
82305843008139952128
92658455991569831744654692615953842176
1014474011154664524427946373126085988481573677491474835889066354349131199152128

[6,28,496,8128,33550336,8589869056,137438691328,
 2305843008139952128,
 2658455991569831744654692615953842176,
 14474011154664524427946373126085988481573677491474\
 835889066354349131199152128]