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A064081 as a simple table

na(n)
14
23
331
413
5781
67
719531
8313
915751
10521
1112207031
12601
13305175781
1413021
15315121
16195313
17190734863281
185167
194768371582031
20375601
21196890121
228138021
232980232238769531
24390001
2595397958987501
26203450521

[4,3,31,13,781,7,19531,313,15751,521,12207031,601,
 305175781,13021,315121,195313,190734863281,5167,
 4768371582031,375601,196890121,8138021,
 2980232238769531,390001,95397958987501,203450521]