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A316668 as a simple table

na(n)
11
22
33
45
54
67
78
89
96
1010
1114
1213
1312
1411
1516
1617
1718
1819
1920
2015
2121
2227
2326
2425
2524
2623
2722
2829
2930
3031
3132
3233
3334
3435
3528
3636
3744
3843
3942
4041
4140
4239
4338
4437
4546
4647
4748
4849
4950
5051
5152
5253
5354
5445
5555
5665
5764
5863
5962
6061
6160
6259
6358
6457
6556
6667
6768

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