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A256994 as a simple table

na(n)
12
23
34
47
511
619
735
867
9131
10259
11515
121027
132051
144099
158195
1616387
1732771
1865539
19131075
20262147
21524291
221048579
232097155
244194307
258388611
2616777219
2733554435
2867108867
29134217731
30268435459
31536870915
321073741827
332147483651
344294967299
358589934595
3617179869187
3734359738371
3868719476739
39137438953475
40274877906947

[2,3,4,7,11,19,35,67,131,259,515,1027,2051,4099,
 8195,16387,32771,65539,131075,262147,524291,
 1048579,2097155,4194307,8388611,16777219,33554435,
 67108867,134217731,268435459,536870915,1073741827,
 2147483651,4294967299,8589934595,17179869187,
 34359738371,68719476739,137438953475,274877906947]