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A039696 as a simple table

na(n)
12
23
34
44
56
67
78
85
95
1011
1112
128
1314
1415
1516
166
1718
188
1920
2012
2122
2223
2324
249
257
2627
276
2816
2930
3031
3132
327
3334
3435
3536
3610
3738
3839
3940
4013
4142
4243
4344
4424
4517
4647
4748
4810
499
5012
5152
5228
5354
549
5556
5617
5758
5859
5960
6032
6162
6263
6323
648
6566
6667
6768
6836
6970
7071
7172
7212
7374
7475

[2,3,4,4,6,7,8,5,5,11,12,8,14,15,16,6,18,8,20,12,
 22,23,24,9,7,27,6,16,30,31,32,7,34,35,36,10,38,39,
 40,13,42,43,44,24,17,47,48,10,9,12,52,28,54,9,56,
 17,58,59,60,32,62,63,23,8,66,67,68,36,70,71,72,12,
 74,75]