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A324586 as a simple table

na(n)
12
25
312
428
564
6147
7338
8776
91783
104096
119410
1221619
1349667
14114105
15262144
16602249
171383604
183178688
197302707
2016777216
2138543921
2288550677
23203436034
24467373275
251073741824
262466810934
275667243324
2813019906166
2929911889591
3068719476736
31157875899766

[2,5,12,28,64,147,338,776,1783,4096,9410,21619,
 49667,114105,262144,602249,1383604,3178688,
 7302707,16777216,38543921,88550677,203436034,
 467373275,1073741824,2466810934,5667243324,
 13019906166,29911889591,68719476736,157875899766]