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A259986 as a simple table

na(n)
13
29
381
481
56561
629889
776545
8636417
93995649
1024151041
11326481921
12689278977
1311573190657
1476876660737
15155240824833
162035980763137
174857090670593
1855637069004801
19157197025673217
201375916505694209
2119656708706009089
22129341461907898369

[3,9,81,81,6561,29889,76545,636417,3995649,
 24151041,326481921,689278977,11573190657,
 76876660737,155240824833,2035980763137,
 4857090670593,55637069004801,157197025673217,
 1375916505694209,19656708706009089,
 129341461907898369]