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A284353 as a simple table

na(n)
01
11
27
313
431
561
6127
7253
8511
91021
102047
114093
128191
1316381
1432767
1565533
16131071
17262141
18524287
191048573
202097151
214194301
228388607
2316777213
2433554431
2567108861
26134217727
27268435453
28536870911
291073741821
302147483647
314294967293
328589934591

[1,1,7,13,31,61,127,253,511,1021,2047,4093,8191,
 16381,32767,65533,131071,262141,524287,1048573,
 2097151,4194301,8388607,16777213,33554431,
 67108861,134217727,268435453,536870911,1073741821,
 2147483647,4294967293,8589934591]