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A284891 as a simple table

na(n)
33
434
5345
63456
734567
8345678
93456789
10345678910
1134567891011
123456789101112
13345678910111213
1434567891011121314
153456789101112131415
16345678910111213141516
1734567891011121314151617
183456789101112131415161718
19345678910111213141516171819

[3,34,345,3456,34567,345678,3456789,345678910,
 34567891011,3456789101112,345678910111213,
 34567891011121314,3456789101112131415,
 345678910111213141516,34567891011121314151617,
 3456789101112131415161718,
 345678910111213141516171819]