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A247503 as a simple table

na(n)
11
22
31
44
55
62
71
88
91
1010
1111
124
131
142
155
1616
1717
182
191
2020
211
2222
2323
248
2525
262
271
284
291
3010
3131
3232
3311
3434
355
364
371
382
391
4040
4141
422
431
4444
455
4646
4747
4816
491
5050
5117
524
531
542
5555
568
571
582
5959
6020
611
6262
631
6464
655
6622
6767
6868
6923
7010
711
728
7373
742
7525
764

[1,2,1,4,5,2,1,8,1,10,11,4,1,2,5,16,17,2,1,20,1,
 22,23,8,25,2,1,4,1,10,31,32,11,34,5,4,1,2,1,40,41,
 2,1,44,5,46,47,16,1,50,17,4,1,2,55,8,1,2,59,20,1,
 62,1,64,5,22,67,68,23,10,1,8,73,2,25,4]