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A131305 as a simple table

na(n)
01
13
21
35
45
51
67
73
83
91
109
1115
125
133
141
1511
1613
177
185
193
201
2113
2211
2311
249
255
263
271
2815
297
309
317
329
335
343
351
3617
379
3813
3911
4011
4111
425
433
441
4519
4643
4715
4813
497
509
5111
525
533
541

[1,3,1,5,5,1,7,3,3,1,9,15,5,3,1,11,13,7,5,3,1,13,
 11,11,9,5,3,1,15,7,9,7,9,5,3,1,17,9,13,11,11,11,5,
 3,1,19,43,15,13,7,9,11,5,3,1]