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A070921 as a simple table

na(n)
11
231
331
4211
531
6961
731
8781
9211
10961
1131
126541
1331
14961
15961
162101
1731
186541
1931
206541
21961
22961
2331
2424211
25211
26961
27781
286541
2931
3029791
3131
324651
33961
34961
35961
3644521
3731
38961
39961
4024211
4131
4229791
4331
446541
456541
46961
4731
4865131
49211
506541

[1,31,31,211,31,961,31,781,211,961,31,6541,31,961,
 961,2101,31,6541,31,6541,961,961,31,24211,211,961,
 781,6541,31,29791,31,4651,961,961,961,44521,31,
 961,961,24211,31,29791,31,6541,6541,961,31,65131,
 211,6541]