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A087009 as a simple table

na(n)
01
10
22
34
46
512
624
748
896
9192
10384
11768
121536
133072
146144
1512288
1624576
1749152
1898304
19196608
20393216
21786432
221572864
233145728
246291456
2512582912
2625165824
2750331648
28100663296
29201326592
30402653184
31805306368
321610612736
333221225472

[1,0,2,4,6,12,24,48,96,192,384,768,1536,3072,6144,
 12288,24576,49152,98304,196608,393216,786432,
 1572864,3145728,6291456,12582912,25165824,
 50331648,100663296,201326592,402653184,805306368,
 1610612736,3221225472]