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A167831 as a simple table

na(n)
00
11
22
33
44
54
63
72
81
90
1010
1111
1212
1313
1414
1514
1613
1712
1811
1910
2020
2121
2222
2323
2424
2524
2623
2722
2821
2920
3030
3131
3232
3333
3434
3534
3633
3732
3831
3930
4040
4141
4242
4343
4444
4544
4643
4742
4841
4940
5049
5148
5247
5346
5445
5544
5643
5742
5841
5940
6039
6138
6237
6336
6435
6534
6633
6732
6831
6930
7029
7128
7227

[0,1,2,3,4,4,3,2,1,0,10,11,12,13,14,14,13,12,11,
 10,20,21,22,23,24,24,23,22,21,20,30,31,32,33,34,
 34,33,32,31,30,40,41,42,43,44,44,43,42,41,40,49,
 48,47,46,45,44,43,42,41,40,39,38,37,36,35,34,33,
 32,31,30,29,28,27]