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A284090 as a simple table

na(n)
01
13
27
315
423
555
6127
7255
8503
91015
101919
113967
126007
1314199
1432767
1565535
16131063
17262135
18524159
191048447
202094967
214192119
228355839
2316744447
2432997367
2566551799
26125796223
27260013951
28393705335
29930576247
302147483647
314294967295
328589934583

[1,3,7,15,23,55,127,255,503,1015,1919,3967,6007,
 14199,32767,65535,131063,262135,524159,1048447,
 2094967,4192119,8355839,16744447,32997367,
 66551799,125796223,260013951,393705335,930576247,
 2147483647,4294967295,8589934583]