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A007679 as a simple table

na(n)
11
21
34
49
516
631
764
8129
9256
10511
111024
122049
134096
148191
1516384
1632769
1765536
18131071
19262144
20524289
211048576
222097151
234194304
248388609
2516777216
2633554431
2767108864
28134217729
29268435456
30536870911

[1,1,4,9,16,31,64,129,256,511,1024,2049,4096,8191,
 16384,32769,65536,131071,262144,524289,1048576,
 2097151,4194304,8388609,16777216,33554431,
 67108864,134217729,268435456,536870911]