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A283506 as a simple table

na(n)
01
10
25
312
429
560
6125
7252
8509
91020
102045
114092
128189
1316380
1432765
1565532
16131069
17262140
18524285
191048572
202097149
214194300
228388605
2316777212
2433554429
2567108860
26134217725
27268435452
28536870909
291073741820
302147483645
314294967292
328589934589

[1,0,5,12,29,60,125,252,509,1020,2045,4092,8189,
 16380,32765,65532,131069,262140,524285,1048572,
 2097149,4194300,8388605,16777212,33554429,
 67108860,134217725,268435452,536870909,1073741820,
 2147483645,4294967292,8589934589]