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A291769 as a simple table

na(n)
01
12
23
34
45
56
67
78
89
910
1011
1112
1213
1314
1415
1516
1617
1718
1819
1918
2020
2121
2222
2323
2424
2525
2626
2727
2828
2929
3030
3131
3218
3332
3433
3534
3635
3736
3837
3938
4039
4140
4225
4341
4412
4518
4617
4742
4843
4944
5045
5146
5247
5348
5419
5542
5615
5749
5822
5950
6051
6127
6252
6353
6454
6555
6628
6756
6857
6958
7059
7160
7241
7361
7462
7563
7664
7727
7826
7965
8066
8167
8268
8369
8470
8571
8672
8773
8874
8975
9076
9160
9242

[1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,
 18,20,21,22,23,24,25,26,27,28,29,30,31,18,32,33,
 34,35,36,37,38,39,40,25,41,12,18,17,42,43,44,45,
 46,47,48,19,42,15,49,22,50,51,27,52,53,54,55,28,
 56,57,58,59,60,41,61,62,63,64,27,26,65,66,67,68,
 69,70,71,72,73,74,75,76,60,42]