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A051049 as a simple table

na(n)
01
11
24
37
416
531
664
7127
8256
9511
101024
112047
124096
138191
1416384
1532767
1665536
17131071
18262144
19524287
201048576
212097151
224194304
238388607
2416777216
2533554431
2667108864
27134217727
28268435456
29536870911
301073741824

[1,1,4,7,16,31,64,127,256,511,1024,2047,4096,8191,
 16384,32767,65536,131071,262144,524287,1048576,
 2097151,4194304,8388607,16777216,33554431,
 67108864,134217727,268435456,536870911,1073741824]