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A197307 as a simple table

na(n)
11
21
31
42
57
62
73
810
910
103
115
1223
1331
1423
155
168
1757
1898
1998
2057
218
2213
23122
24344
25639
26344
27122
2813
2921
30275
311139
323181
333181
341139
35275
3621
3734
38623
393750
4015930
4127709
4215930
433750
44623
4534
4655
471394
4812470
4985087
50207538
51207538
5285087
5312470
541394
5555
5689

[1,1,1,2,7,2,3,10,10,3,5,23,31,23,5,8,57,98,98,57,
 8,13,122,344,639,344,122,13,21,275,1139,3181,3181,
 1139,275,21,34,623,3750,15930,27709,15930,3750,
 623,34,55,1394,12470,85087,207538,207538,85087,
 12470,1394,55,89]