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A089864 as a simple table

na(n)
00
11
22
33
45
54
66
78
87
912
1013
1111
129
1310
1415
1514
1619
1721
1822
1916
2020
2117
2218
2331
2432
2534
2635
2736
2830
2933
3028
3123
3224
3329
3425
3526
3627
3740
3841
3939
4037
4138
4252
4351
4456
4558
4659
4760
4862
4963
5064
5143
5242
5353
5457
5561
5644
5754
5845
5946
6047
6155
6248
6349
6450
6587
6688
6790
6891
6992
7096
7197
7299

[0,1,2,3,5,4,6,8,7,12,13,11,9,10,15,14,19,21,22,
 16,20,17,18,31,32,34,35,36,30,33,28,23,24,29,25,
 26,27,40,41,39,37,38,52,51,56,58,59,60,62,63,64,
 43,42,53,57,61,44,54,45,46,47,55,48,49,50,87,88,
 90,91,92,96,97,99]