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A085235 as a simple table

na(n)
12
23
34
45
56
67
78
89
910
1011
1113
1214
1315
1416
1517
1618
1719
1820
1921
2022
2123
2225
2326
2427
2528
2629
2731
2832
2933
3034
3135
3236
3337
3438
3539
3641
3742
3843
3944
4046
4147
4249
4350
4451
4552
4653
4754
4855
4957
5058
5159
5261
5362
5464
5565
5666
5767
5868
5969
6071
6172
6273
6374
6475
6576
6677
6778
6879
6981

[2,3,4,5,6,7,8,9,10,11,13,14,15,16,17,18,19,20,21,
 22,23,25,26,27,28,29,31,32,33,34,35,36,37,38,39,
 41,42,43,44,46,47,49,50,51,52,53,54,55,57,58,59,
 61,62,64,65,66,67,68,69,71,72,73,74,75,76,77,78,
 79,81]