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A285543 as a simple table

na(n)
01
13
26
315
428
563
6120
7255
8496
91023
102016
114095
128128
1316383
1432640
1565535
16130816
17262143
18523776
191048575
202096128
214194303
228386560
2316777215
2433550336
2567108863
26134209536
27268435455
28536854528
291073741823
302147450880
314294967295
328589869056

[1,3,6,15,28,63,120,255,496,1023,2016,4095,8128,
 16383,32640,65535,130816,262143,523776,1048575,
 2096128,4194303,8386560,16777215,33550336,
 67108863,134209536,268435455,536854528,1073741823,
 2147450880,4294967295,8589869056]