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A274213 as a simple table

na(n)
01
12
23
36
46
56
64
75
86
99
109
119
129
139
149
157
168
179
1812
1912
2012
2112
2212
2312
2412
2512
2612
2710
2811
2912
3015
3115
3215
3315
3415
3515
3615
3715
3815
3915
4015
4115
4213
4314
4415
4518
4618
4718
4818
4918
5018
5118
5218
5318
5418
5518
5618
5718
5818
5918
6016
6117
6218
6321
6421
6521
6621
6721
6821
6921

[1,2,3,6,6,6,4,5,6,9,9,9,9,9,9,7,8,9,12,12,12,12,
 12,12,12,12,12,10,11,12,15,15,15,15,15,15,15,15,
 15,15,15,15,13,14,15,18,18,18,18,18,18,18,18,18,
 18,18,18,18,18,18,16,17,18,21,21,21,21,21,21,21]