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A279872 as a simple table

na(n)
01
10
27
30
431
50
6127
70
8511
90
102047
110
128191
130
1432767
150
16131071
170
18524287
190
202097151
210
228388607
230
2433554431
250
26134217727
270
28536870911
290
302147483647
310
328589934591
330
3434359738367
350
36137438953471
370
38549755813887
390
402199023255551
410

[1,0,7,0,31,0,127,0,511,0,2047,0,8191,0,32767,0,
 131071,0,524287,0,2097151,0,8388607,0,33554431,0,
 134217727,0,536870911,0,2147483647,0,8589934591,0,
 34359738367,0,137438953471,0,549755813887,0,
 2199023255551,0]