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A306821 as a simple table

na(n)
02
12
23
31
415
51
621
71
815
91
1033
111
121365
131
143
151
16255
171
18399
191
20165
211
2269
231
241365
251
263
271
28435
291
307161
311
32255
331
343
351
36959595
371
383
391
406765
411
42903
431
44345
451
46141
471
4823205
491
5033
511
52795
531
54399
551

[2,2,3,1,15,1,21,1,15,1,33,1,1365,1,3,1,255,1,399,
 1,165,1,69,1,1365,1,3,1,435,1,7161,1,255,1,3,1,
 959595,1,3,1,6765,1,903,1,345,1,141,1,23205,1,33,
 1,795,1,399,1]