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A089854 as a simple table

na(n)
00
11
22
33
44
55
66
78
87
99
1010
1111
1212
1313
1414
1515
1619
1721
1822
1916
2020
2117
2218
2323
2424
2525
2626
2727
2828
2929
3030
3131
3232
3333
3434
3535
3636
3737
3838
3939
4040
4141
4251
4352
4456
4558
4659
4760
4862
4963
5064
5142
5243
5353
5457
5561
5644
5754
5845
5946
6047
6155
6248
6349
6450
6565
6666
6767
6868
6969
7070
7171
7272

[0,1,2,3,4,5,6,8,7,9,10,11,12,13,14,15,19,21,22,
 16,20,17,18,23,24,25,26,27,28,29,30,31,32,33,34,
 35,36,37,38,39,40,41,51,52,56,58,59,60,62,63,64,
 42,43,53,57,61,44,54,45,46,47,55,48,49,50,65,66,
 67,68,69,70,71,72]