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A198461 as a simple table

na(n)
12
23
34
43
57
68
74
812
913
105
1118
1219
136
146
159
166
1711
1813
196
2025
2126
227
2315
2417
257
2633
2734
288
2942
3043
319
3210
3314
349
3515
3618
379
3852
3953
4010
4130
4232
4310
4463
4564
4611
4736
4838
4911
5075
5176
5212
5314
5419
5512
5619
5723
5812
5927
6030
6112
6288
6389
6413
65102
66103
6714
6857
6959
7014
71117
72118

[2,3,4,3,7,8,4,12,13,5,18,19,6,6,9,6,11,13,6,25,
 26,7,15,17,7,33,34,8,42,43,9,10,14,9,15,18,9,52,
 53,10,30,32,10,63,64,11,36,38,11,75,76,12,14,19,
 12,19,23,12,27,30,12,88,89,13,102,103,14,57,59,14,
 117,118]