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A052548 as a simple table

na(n)
03
14
26
310
418
534
666
7130
8258
9514
101026
112050
124098
138194
1416386
1532770
1665538
17131074
18262146
19524290
201048578
212097154
224194306
238388610
2416777218
2533554434
2667108866
27134217730
28268435458
29536870914
301073741826
312147483650

[3,4,6,10,18,34,66,130,258,514,1026,2050,4098,
 8194,16386,32770,65538,131074,262146,524290,
 1048578,2097154,4194306,8388610,16777218,33554434,
 67108866,134217730,268435458,536870914,1073741826,
 2147483650]