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A083976 as a simple table

na(n)
15
215451
315551
41550551
5154555451
6155535551
7355555553
835555155553
975555555557
101555550555551
11152555555555251
1210555555355555501
1315505555555550551
1435555555755555553
151555555055505555551
161555555551555555551
17115555555555555555511

[5,15451,15551,1550551,154555451,155535551,
 355555553,35555155553,75555555557,1555550555551,
 152555555555251,10555555355555501,
 15505555555550551,35555555755555553,
 1555555055505555551,1555555551555555551,
 115555555555555555511]