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A286207 as a simple table

na(n)
01
13
26
315
424
563
6120
7255
8480
91023
101920
114095
127680
1316383
1431104
1565535
16130560
17262143
18522240
191048575
202088960
214194303
227831552
2316777215
2433423360
2567108863
26133693440
27268435455
28534773760
291073741823
302145484800
314294967295
328582463488

[1,3,6,15,24,63,120,255,480,1023,1920,4095,7680,
 16383,31104,65535,130560,262143,522240,1048575,
 2088960,4194303,7831552,16777215,33423360,
 67108863,133693440,268435455,534773760,1073741823,
 2145484800,4294967295,8582463488]