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A227538 as a simple table

na(n)
00
11
22
33
44
55
64
77
88
96
105
119
128
139
147
156
1611
1712
189
1910
208
217
2211
2312
2413
2510
2611
279
288
2915
3012
3113
3214
3311
3412
3510
369
3716
3817
3913
4014
4115
4212
4313
4411
4510
4616
4717
4818
4914
5015
5116
5213
5314
5412
5511
5616
5717
5818
5919
6015
6116
6217
6314
6415
6513
6612
6722
6817
6918
7019

[0,1,2,3,4,5,4,7,8,6,5,9,8,9,7,6,11,12,9,10,8,7,
 11,12,13,10,11,9,8,15,12,13,14,11,12,10,9,16,17,
 13,14,15,12,13,11,10,16,17,18,14,15,16,13,14,12,
 11,16,17,18,19,15,16,17,14,15,13,12,22,17,18,19]