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A247891 as a simple table

na(n)
00
11
22
33
45
56
67
74
810
911
108
119
1215
1312
1413
1514
1621
1722
1823
1920
2026
2127
2224
2325
2431
2528
2629
2730
2816
2917
3018
3119
3242
3343
3440
3541
3647
3744
3845
3946
4032
4133
4234
4335
4437
4538
4639
4736
4863
4960
5061
5162
5248
5349
5450
5551
5653
5754
5855
5952
6058
6159
6256
6357
6485
6586
6687
6784
6890

[0,1,2,3,5,6,7,4,10,11,8,9,15,12,13,14,21,22,23,
 20,26,27,24,25,31,28,29,30,16,17,18,19,42,43,40,
 41,47,44,45,46,32,33,34,35,37,38,39,36,63,60,61,
 62,48,49,50,51,53,54,55,52,58,59,56,57,85,86,87,
 84,90]