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A256991 as a simple table

na(n)
10
21
31
42
52
63
73
84
94
105
116
125
136
147
157
168
178
189
1910
209
2110
2211
2312
2411
2513
2614
2712
2813
2914
3015
3115
3216
3316
3417
3518
3617
3718
3819
3920
4019
4121
4222
4320
4421
4522
4623
4724
4823
4925
5026
5124
5225
5327
5428
5526
5629
5730
5827
5928
6029
6130
6231
6331
6432
6532
6633
6734
6833
6934
7035
7136
7235
7337
7438
7536
7637
7738
7839
7940
8039
8141
8242
8340
8441
8543
8644
8742

[0,1,1,2,2,3,3,4,4,5,6,5,6,7,7,8,8,9,10,9,10,11,
 12,11,13,14,12,13,14,15,15,16,16,17,18,17,18,19,
 20,19,21,22,20,21,22,23,24,23,25,26,24,25,27,28,
 26,29,30,27,28,29,30,31,31,32,32,33,34,33,34,35,
 36,35,37,38,36,37,38,39,40,39,41,42,40,41,43,44,
 42]