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A084634 as a simple table

na(n)
01
12
24
39
421
548
6106
7227
8475
9978
101992
114029
128113
1316292
1432662
1565415
16130935
17261990
18524116
191048385
202096941
214194072
228388354
2316776939
2433554131
2567108538
26134217376
27268435077
28536870505
291073741388
302147483182
314294966799
328589934063

[1,2,4,9,21,48,106,227,475,978,1992,4029,8113,
 16292,32662,65415,130935,261990,524116,1048385,
 2096941,4194072,8388354,16776939,33554131,
 67108538,134217376,268435077,536870505,1073741388,
 2147483182,4294966799,8589934063]