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A213970 as a simple table

na(n)
11
23
313
431
5113
6131
7133
8311
9313
10331
111113
121131
131133
141311
151331
161333
173111
183113
193133
203311
213313
223331
2311113
2411131
2511133
2611311
2711313
2811331
2911333
3013111
3113113
3213131
3313133
3413311
3513313
3613331
3713333
3831111
3931113
4031131
4131133
4231311
4331313
4431331
4531333
4633111
4733113
4833131
4933133
5033311
5133313
5233331

[1,3,13,31,113,131,133,311,313,331,1113,1131,1133,
 1311,1331,1333,3111,3113,3133,3311,3313,3331,
 11113,11131,11133,11311,11313,11331,11333,13111,
 13113,13131,13133,13311,13313,13331,13333,31111,
 31113,31131,31133,31311,31313,31331,31333,33111,
 33113,33131,33133,33311,33313,33331]