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A249920 as a simple table

na(n)
11
25
32
44
53
66
78
87
99
1011
1110
1212
1313
1414
1517
1615
1716
1818
1920
2019
2121
2223
2322
2424
2525
2626
2728
2827
2929
3032
3130
3231
3333
3435
3534
3636
3738
3837
3939
4041
4140
4242
4343
4444
4546
4645
4747
4848
4950
5049
5151
5253
5352
5454
5556
5655
5757
5858
5959
6060
6161
6262
6363
6465
6564
6666
6767

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