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A306681 as a simple table

na(n)
11
23
39
427
5121
6313
7939
827927
912127121
10313121313
11939313939
122792793927927
13121271212792712127121
1431312131312127121313121313
15939313939313121313939313939
1627927939279279393139392792793927927
171212712127927121271212792793927927121271212792712127121

[1,3,9,27,121,313,939,27927,12127121,313121313,
 939313939,2792793927927,121271212792712127121,
 31312131312127121313121313,
 939313939313121313939313939,
 27927939279279393139392792793927927,
 12127121279271212712127927939279271212712127927121\
 27121]