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A139684 as a simple table

na(n)
01
12
28
364
41024
532768
62097152
7268435456
868719476736
934575388318705
1032448313431713405
1152469561348291720657
12134755962211702695614887
13514006997326078783646604259
142768435750908792178769980837441
1520276667790903553518295082198527981

[1,2,8,64,1024,32768,2097152,268435456,
 68719476736,34575388318705,32448313431713405,
 52469561348291720657,134755962211702695614887,
 514006997326078783646604259,
 2768435750908792178769980837441,
 20276667790903553518295082198527981]