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A112993 as a simple table

na(n)
18
227
3343
4512
519683
679507
7103823
8110592
9140608
10148877
11250047
12314432
13778688
143869893
155088448
166539203
177077888
1818191447
1954010152
2067917312
2175686967
2296071912
23102503232
24109215352
25115501303
26146363183
27202262003
28224755712

[8,27,343,512,19683,79507,103823,110592,140608,
 148877,250047,314432,778688,3869893,5088448,
 6539203,7077888,18191447,54010152,67917312,
 75686967,96071912,102503232,109215352,115501303,
 146363183,202262003,224755712]