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A173596 as a simple table

na(n)
1311
2733
3991
41511
51811
63433
73733
87717
97757
1016111
1179777
1299989
13112111
14333323
15334333
16733333
17778777
18787777
19911111
20999199
211171111
223733333
239999299
2411131111
2511911111

[311,733,991,1511,1811,3433,3733,7717,7757,16111,
 79777,99989,112111,333323,334333,733333,778777,
 787777,911111,999199,1171111,3733333,9999299,
 11131111,11911111]