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A116966 as a simple table

na(n)
01
13
22
34
45
57
66
78
89
911
1010
1112
1213
1315
1414
1516
1617
1719
1818
1920
2021
2123
2222
2324
2425
2527
2626
2728
2829
2931
3030
3132
3233
3335
3434
3536
3637
3739
3838
3940
4041
4143
4242
4344
4445
4547
4646
4748
4849
4951
5050
5152
5253
5355
5454
5556
5657
5759
5858
5960
6061
6163
6262
6364
6465
6567
6666
6768

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