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A155930 as a simple table

na(n)
18
227
3729
41728
527000
6185193
7287496
8658503
91367631
101728000
117414875
1214348907
1314886936
1421717639
1554010152
1655306341
1780621568
1891125000
19104487111
20110592000
21212776173
22275894451
23437245479
24531441000
25812166237

[8,27,729,1728,27000,185193,287496,658503,1367631,
 1728000,7414875,14348907,14886936,21717639,
 54010152,55306341,80621568,91125000,104487111,
 110592000,212776173,275894451,437245479,531441000,
 812166237]