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A131421 as a simple table

na(n)
11
23
35
45
57
69
77
89
911
1013
119
1211
1313
1415
1517
1611
1713
1815
1917
2019
2121
2213
2315
2417
2519
2621
2723
2825
2915
3017
3119
3221
3323
3425
3527
3629
3717
3819
3921
4023
4125
4227
4329
4431
4533
4619
4721
4823
4925
5027
5129
5231
5333
5435
5537
5621
5723
5825
5927
6029
6131
6233
6335
6437
6539
6641

[1,3,5,5,7,9,7,9,11,13,9,11,13,15,17,11,13,15,17,
 19,21,13,15,17,19,21,23,25,15,17,19,21,23,25,27,
 29,17,19,21,23,25,27,29,31,33,19,21,23,25,27,29,
 31,33,35,37,21,23,25,27,29,31,33,35,37,39,41]