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A066181 as a simple table

na(n)
11
23
32
45
56
64
78
89
910
107
1112
1213
1314
1415
1511
1617
1718
1819
1920
2021
2116
2223
2324
2425
2526
2627
2728
2822
2930
3031
3132
3233
3334
3435
3536
3629
3738
3839
3940
4041
4142
4243
4344
4445
4537
4647
4748
4849
4950
5051
5152
5253
5354
5455
5546
5657
5758
5859
5960
6061
6162
6263
6364
6465
6566
6656
6768
6869
6970
7071
7172
7273

[1,3,2,5,6,4,8,9,10,7,12,13,14,15,11,17,18,19,20,
 21,16,23,24,25,26,27,28,22,30,31,32,33,34,35,36,
 29,38,39,40,41,42,43,44,45,37,47,48,49,50,51,52,
 53,54,55,46,57,58,59,60,61,62,63,64,65,66,56,68,
 69,70,71,72,73]