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A247419 as a simple table

na(n)
11
22
34
45
56
67
78
89
911
1012
1113
1214
1316
1417
1518
1619
1720
1821
1923
2024
2125
2226
2327
2428
2530
2631
2732
2833
2935
3036
3137
3238
3339
3440
3542
3643
3744
3845
3946
4047
4148
4249
4350
4451
4553
4654
4755
4856
4957
5058
5160
5261
5362
5463
5565
5666
5767
5868
5969
6070
6172
6273
6374
6475
6576
6677
6779

[1,2,4,5,6,7,8,9,11,12,13,14,16,17,18,19,20,21,23,
 24,25,26,27,28,30,31,32,33,35,36,37,38,39,40,42,
 43,44,45,46,47,48,49,50,51,53,54,55,56,57,58,60,
 61,62,63,65,66,67,68,69,70,72,73,74,75,76,77,79]