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A017103 as a simple table

na(n)
027
11331
26859
319683
442875
579507
6132651
7205379
8300763
9421875
10571787
11753571
12970299
131225043
141520875
151860867
162248091
172685619
183176523
193723875
204330747
215000211
225735339
236539203
247414875

[27,1331,6859,19683,42875,79507,132651,205379,
 300763,421875,571787,753571,970299,1225043,
 1520875,1860867,2248091,2685619,3176523,3723875,
 4330747,5000211,5735339,6539203,7414875]