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A307447 as a simple table

na(n)
11
21
33
45
55
65
73
83
93
105
117
127
139
1411
1511
1611
1713
1815
1915
2017
2119
2219
2319
2417
2517
2617
2719
2821
2921
3021
3119
3219
3319
3417
3515
3615
3713
3811
3911
4011
419
429
439
4411
4513
4613
4713
4811
4911
5011
5113
5215
5315
5417
5519
5619
5719
5821
5923
6023
6125
6227
6327
6427
6525
6625
6725
6827

[1,1,3,5,5,5,3,3,3,5,7,7,9,11,11,11,13,15,15,17,
 19,19,19,17,17,17,19,21,21,21,19,19,19,17,15,15,
 13,11,11,11,9,9,9,11,13,13,13,11,11,11,13,15,15,
 17,19,19,19,21,23,23,25,27,27,27,25,25,25,27]