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A251716 as a simple table

na(n)
12
23
34
47
55
66
78
89
97
108
1120
1213
1311
1410
1510
1621
1722
1815
1913
2012
2112
2228
2323
2424
2517
2616
2717
2814
2941
3030
3125
3234
3327
3418
3519
3616
3749
3843
3932
4036
4146
4238
4326
4421
4518
4659
4751
4845
4935
5038
5166
5240
5332
5424
5520
5660
5761
5853
5947
6067
6154
6268
6342
6434
6526
6625
6777

[2,3,4,7,5,6,8,9,7,8,20,13,11,10,10,21,22,15,13,
 12,12,28,23,24,17,16,17,14,41,30,25,34,27,18,19,
 16,49,43,32,36,46,38,26,21,18,59,51,45,35,38,66,
 40,32,24,20,60,61,53,47,67,54,68,42,34,26,25,77]