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A297868 as a simple table

na(n)
18
227
332
4125
5243
6512
71331
82048
932768
1050653
1179507
12103823
13131072
14161051
15177147
16357911
171419857
182097152
192248091
203869893
2111089567
2215813251
2316974593
2420511149
2528934443
2669343957
27115501303
28147008443
29263374721
30536870912
31844596301
321284365503
331305751357

[8,27,32,125,243,512,1331,2048,32768,50653,79507,
 103823,131072,161051,177147,357911,1419857,
 2097152,2248091,3869893,11089567,15813251,
 16974593,20511149,28934443,69343957,115501303,
 147008443,263374721,536870912,844596301,
 1284365503,1305751357]