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A068839 as a simple table

na(n)
111
231
31531
467531
51397531
6311197531
716131197531
82515131197531
971715131197531
1033191715131197531
117621191715131197531
12232321191715131197531
137252321191715131197531
141327252321191715131197531
15322927252321191715131197531
1619312927252321191715131197531

[11,31,1531,67531,1397531,311197531,16131197531,
 2515131197531,71715131197531,33191715131197531,
 7621191715131197531,232321191715131197531,
 7252321191715131197531,1327252321191715131197531,
 322927252321191715131197531,
 19312927252321191715131197531]