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A113981 as a simple table

na(n)
11
22
34
43
56
65
78
87
910
109
1112
1211
1314
1413
1516
1615
1718
1817
1920
2019
2123
2224
2321
2422
2526
2625
2728
2827
2930
3029
3132
3231
3336
3437
3540
3633
3734
3841
3942
4035
4138
4239
4344
4443
4546
4645
4748
4847
4950
5049
5152
5251
5354
5453
5556
5655
5759
5860
5957
6058
6162
6261
6364
6463
6566
6665
6768
6867
6970
7069
7172
7271

[1,2,4,3,6,5,8,7,10,9,12,11,14,13,16,15,18,17,20,
 19,23,24,21,22,26,25,28,27,30,29,32,31,36,37,40,
 33,34,41,42,35,38,39,44,43,46,45,48,47,50,49,52,
 51,54,53,56,55,59,60,57,58,62,61,64,63,66,65,68,
 67,70,69,72,71]