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A071193 as a simple table

na(n)
12
24
34
45
56
67
78
89
911
1011
1112
1213
1314
1416
1516
1617
1718
1819
1920
2021
2123
2223
2324
2425
2527
2627
2729
2829
2930
3031
3132
3233
3336
3436
3536
3637
3738
3840
3940
4041
4142
4243
4344
4446
4546
4647
4748
4849
4950
5051
5152
5253
5354
5455
5556
5657
5759
5859
5960
6061
6162
6263
6364

[2,4,4,5,6,7,8,9,11,11,12,13,14,16,16,17,18,19,20,
 21,23,23,24,25,27,27,29,29,30,31,32,33,36,36,36,
 37,38,40,40,41,42,43,44,46,46,47,48,49,50,51,52,
 53,54,55,56,57,59,59,60,61,62,63,64]