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A167388 as a simple table

na(n)
131
2131
3331
4431
5631
61031
71231
81531
91831
101931
112131
122531
132731
143331
153631
163931
174231
184831
194931
205231
215431
225531
236131
247331
258231
268431
278731
288831
299431
309631
319931
3210331
3310531
3410631
3510831
3611131
3711731
3811831
3913331
4013831
4113931

[31,131,331,431,631,1031,1231,1531,1831,1931,2131,
 2531,2731,3331,3631,3931,4231,4831,4931,5231,5431,
 5531,6131,7331,8231,8431,8731,8831,9431,9631,9931,
 10331,10531,10631,10831,11131,11731,11831,13331,
 13831,13931]