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A076550 as a simple table

na(n)
01
12
23
37
48
515
632
764
863
9224
10255
111280
12512
133968
146399
1510240
164095
1714336
1832768
1965535
20229375
21180224
22483327
23262143
242097151
251048575
2614680064
2717432576
2833554432
2967108864
3016777215

[1,2,3,7,8,15,32,64,63,224,255,1280,512,3968,6399,
 10240,4095,14336,32768,65535,229375,180224,483327,
 262143,2097151,1048575,14680064,17432576,33554432,
 67108864,16777215]