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A265721 as a simple table

na(n)
01
10
24
399
416
51935
664
732319
8256
9522495
101024
118381439
124096
13134189055
1416384
152147368959
1665536
1734359279615
18262144
19549753978879
201048576
218796085682175
224194304
23140737458995199
2416777216
252251799696244735
2667108864
2736028796549201919
28268435456

[1,0,4,99,16,1935,64,32319,256,522495,1024,
 8381439,4096,134189055,16384,2147368959,65536,
 34359279615,262144,549753978879,1048576,
 8796085682175,4194304,140737458995199,16777216,
 2251799696244735,67108864,36028796549201919,
 268435456]