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A000247 as a simple table

na(n)
20
33
410
525
656
7119
8246
9501
101012
112035
124082
138177
1416368
1532751
1665518
17131053
18262124
19524267
201048554
212097129
224194280
238388583
2416777190
2533554405
2667108836
27134217699
28268435426
29536870881
301073741792
312147483615

[0,3,10,25,56,119,246,501,1012,2035,4082,8177,
 16368,32751,65518,131053,262124,524267,1048554,
 2097129,4194280,8388583,16777190,33554405,
 67108836,134217699,268435426,536870881,1073741792,
 2147483615]