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A020986 as a simple table

na(n)
01
12
23
32
43
54
63
74
85
96
107
116
125
134
145
154
165
176
187
196
207
218
227
238
247
256
265
276
287
298
307
318
329
3310
3411
3510
3611
3712
3811
3912
4013
4114
4215
4314
4413
4512
4613
4712
4811
4910
509
5110
529
538
549
558
569
5710
5811
5910
609
618
629
638
649
6510
6611
6710
6811
6912
7011
7112
7213
7314
7415
7514
7613
7712
7813
7912
8013
8114
8215
8314
8415
8516

[1,2,3,2,3,4,3,4,5,6,7,6,5,4,5,4,5,6,7,6,7,8,7,8,
 7,6,5,6,7,8,7,8,9,10,11,10,11,12,11,12,13,14,15,
 14,13,12,13,12,11,10,9,10,9,8,9,8,9,10,11,10,9,8,
 9,8,9,10,11,10,11,12,11,12,13,14,15,14,13,12,13,
 12,13,14,15,14,15,16]