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A151691 as a simple table

na(n)
01
12
21
32
45
54
61
72
85
94
105
1112
1213
136
141
152
165
174
185
1912
2013
216
225
2312
2413
2514
2629
2738
2825
298
301
312
325
334
345
3512
3613
376
385
3912
4013
4114
4229
4338
4425
458
465
4712
4813
4914
5029
5138
5225
5316
5429
5538
5641
5772
58105
5988
6041
6110
621
632
645
654
665
6712
6813
696
705
7112
7213
7314
7429
7538
7625
778
785
7912
8013
8114
8229

[1,2,1,2,5,4,1,2,5,4,5,12,13,6,1,2,5,4,5,12,13,6,
 5,12,13,14,29,38,25,8,1,2,5,4,5,12,13,6,5,12,13,
 14,29,38,25,8,5,12,13,14,29,38,25,16,29,38,41,72,
 105,88,41,10,1,2,5,4,5,12,13,6,5,12,13,14,29,38,
 25,8,5,12,13,14,29]