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A109451 as a simple table

na(n)
11
23
32
45
54
66
77
88
99
1011
1110
1213
1312
1414
1515
1616
1717
1819
1918
2021
2120
2222
2323
2424
2525
2627
2726
2829
2928
3030
3131
3232
3333
3435
3534
3637
3736
3838
3939
4040
4141
4243
4342
4445
4544
4646
4747
4848
4949
5051
5150
5253
5352
5454
5555
5656
5757
5859
5958
6061
6160
6262
6363
6464
6565
6667
6766
6869
6968
7070
7171
7272

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