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A286645 as a simple table

na(n)
01
13
24
315
424
563
696
7255
8480
91023
101920
114095
127680
1316383
1430720
1565535
16130560
17262143
18276480
191048575
201056768
214194303
224227072
2316777215
2425624576
2567108863
26102498304
27268435455
28510656512
291073741823
302043150336
314294967295
326563954688

[1,3,4,15,24,63,96,255,480,1023,1920,4095,7680,
 16383,30720,65535,130560,262143,276480,1048575,
 1056768,4194303,4227072,16777215,25624576,
 67108863,102498304,268435455,510656512,1073741823,
 2043150336,4294967295,6563954688]