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A320465 as a simple table

na(n)
12
24
37
416
531
662
7127
8256
9508
101022
112047
124088
138191
1416382
1532764
1665536
17131071
18262130
19524287
201048568
212097148
224194302
238388607
2416777208
2533554416
2667108862
27134217715
28268435448
29536870911
301073741822
312147483647
324294967296
338589934588

[2,4,7,16,31,62,127,256,508,1022,2047,4088,8191,
 16382,32764,65536,131071,262130,524287,1048568,
 2097148,4194302,8388607,16777208,33554416,
 67108862,134217715,268435448,536870911,1073741822,
 2147483647,4294967296,8589934588]