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A290065 as a simple table

na(n)
01
11
27
315
47
515
663
7127
8479
9959
10255
11511
121023
132047
143071
156143
1624063
1748127
18102399
19204799
20344063
21688127
222949119
235898239
2425133055
2550266111
26117309439
27234618879
28536346623
291072693247
301912340479
313824680959
327716339711
3315432679423

[1,1,7,15,7,15,63,127,479,959,255,511,1023,2047,
 3071,6143,24063,48127,102399,204799,344063,688127,
 2949119,5898239,25133055,50266111,117309439,
 234618879,536346623,1072693247,1912340479,
 3824680959,7716339711,15432679423]