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A331835 as a simple table

na(n)
00
11
22
33
43
54
65
76
85
96
107
118
128
139
1410
1511
167
178
189
1910
2010
2111
2212
2313
2412
2513
2614
2715
2815
2916
3017
3118
3211
3312
3413
3514
3614
3715
3816
3917
4016
4117
4218
4319
4419
4520
4621
4722
4818
4919
5020
5121
5221
5322
5423
5524
5623
5724
5825
5926
6026
6127
6228
6329
6413
6514
6615
6716
6816

[0,1,2,3,3,4,5,6,5,6,7,8,8,9,10,11,7,8,9,10,10,11,
 12,13,12,13,14,15,15,16,17,18,11,12,13,14,14,15,
 16,17,16,17,18,19,19,20,21,22,18,19,20,21,21,22,
 23,24,23,24,25,26,26,27,28,29,13,14,15,16,16]