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A082894 as a simple table

na(n)
12
24
39
416
530
666
7126
8256
9513
101020
112046
124092
138190
1416380
1532775
1665536
17131070
18262152
19524286
201048580
212097144
224194300
238388606
2416777224
2533554425
2667108860
27134217729
28268435468
29536870910
301073741820
312147483646

[2,4,9,16,30,66,126,256,513,1020,2046,4092,8190,
 16380,32775,65536,131070,262152,524286,1048580,
 2097144,4194300,8388606,16777224,33554425,
 67108860,134217729,268435468,536870910,1073741820,
 2147483646]