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A027925 as a simple table

na(n)
11
22
34
45
56
67
78
89
911
1012
1113
1214
1315
1417
1518
1619
1720
1821
1923
2024
2125
2226
2327
2428
2530
2631
2732
2833
2934
3036
3137
3238
3339
3440
3542
3643
3744
3845
3946
4047
4149
4250
4351
4452
4553
4655
4756
4857
4958
5059
5161
5262
5363
5464
5565
5667
5768
5869
5970
6071
6172
6274
6375

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