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A213197 as a simple table

na(n)
11
23
34
42
56
65
78
89
911
1012
117
1215
1310
1414
1513
1617
1718
1820
1921
2023
2124
2216
2328
2419
2527
2622
2726
2825
2930
3031
3133
3234
3336
3437
3539
3640
3729
3845
3932
4044
4135
4243
4338
4442
4541
4647
4748
4850
4951
5053
5154
5256
5357
5459
5560
5646
5766
5849
5965
6052
6164
6255
6363
6458
6562
6661
6768

[1,3,4,2,6,5,8,9,11,12,7,15,10,14,13,17,18,20,21,
 23,24,16,28,19,27,22,26,25,30,31,33,34,36,37,39,
 40,29,45,32,44,35,43,38,42,41,47,48,50,51,53,54,
 56,57,59,60,46,66,49,65,52,64,55,63,58,62,61,68]