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A117353 as a simple table

na(n)
01
12
25
39
418
533
665
7126
8253
9505
101018
112041
124097
138198
1416405
1532793
1665570
17131089
18262145
19524238
201048493
212097017
224194186
238388521
2416777281
2533554646
2667109317
27134218265
28268436018
29536871105
301073741505
312147482398

[1,2,5,9,18,33,65,126,253,505,1018,2041,4097,8198,
 16405,32793,65570,131089,262145,524238,1048493,
 2097017,4194186,8388521,16777281,33554646,
 67109317,134218265,268436018,536871105,1073741505,
 2147482398]