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A289932 as a simple table

na(n)
01
11
27
315
47
515
6127
7127
8255
9767
10383
113839
126911
1312799
1428159
1564511
1613823
1729695
18514047
191023999
202047999
212080767
224268031
238732671
2416121855
2540599551
2647611903
27195952639
28239337471
29750256127
30292552703
313671064575
323059744767
338325693439

[1,1,7,15,7,15,127,127,255,767,383,3839,6911,
 12799,28159,64511,13823,29695,514047,1023999,
 2047999,2080767,4268031,8732671,16121855,40599551,
 47611903,195952639,239337471,750256127,292552703,
 3671064575,3059744767,8325693439]