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A222188 as a simple table

na(n)
12
23
33
44
57
64
76
813
913
106
118
1234
1336
1434
158
1613
1778
18158
19158
2078
2113
2218
23237
24708
251459
26708
27237
2818
2930
30687
314236
3214676
3314676
344236
35687
3630
3746
382299
3926412
40184854
41340880
42184854
4326412
442299
4546

[2,3,3,4,7,4,6,13,13,6,8,34,36,34,8,13,78,158,158,
 78,13,18,237,708,1459,708,237,18,30,687,4236,
 14676,14676,4236,687,30,46,2299,26412,184854,
 340880,184854,26412,2299,46]