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A075539 as a simple table

na(n)
19
227
32187
419683
5300763
61092727
72048383
86128487
915069223
1021717639
1124642171
1227818127
1336264691
1438958219
1554439939
1665450827
1784604519
1890224199
19112678587
20133432831
21139798359
22143055667
23163667323
24246491883
25313046839
26341532099
27347428927

[9,27,2187,19683,300763,1092727,2048383,6128487,
 15069223,21717639,24642171,27818127,36264691,
 38958219,54439939,65450827,84604519,90224199,
 112678587,133432831,139798359,143055667,163667323,
 246491883,313046839,341532099,347428927]