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A195095 as a simple table

na(n)
11
22
33
48
515
630
763
8128
9252
10510
111023
122040
134095
148190
1516365
1632768
1765535
18131040
19262143
20524280
211048509
222097150
234194303
248388480
2516777200
2633554430
2767108608
28134217720
29268435455
30536870370
311073741823
322147483648
334294966269
348589934590

[1,2,3,8,15,30,63,128,252,510,1023,2040,4095,8190,
 16365,32768,65535,131040,262143,524280,1048509,
 2097150,4194303,8388480,16777200,33554430,
 67108608,134217720,268435455,536870370,1073741823,
 2147483648,4294966269,8589934590]