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A028803 as a simple table

na(n)
12
23
35
46
57
68
711
812
913
1014
1115
1217
1318
1420
1521
1622
1723
1824
1926
2027
2128
2229
2330
2432
2533
2635
2737
2838
2939
3041
3142
3243
3344
3447
3548
3650
3751
3852
3953
4056
4157
4258
4359
4460
4562
4663
4765
4866
4967
5068
5169
5271
5372
5473
5574
5675
5777
5878
5980
6082
6183
6284
6386
6487
6588
6689

[2,3,5,6,7,8,11,12,13,14,15,17,18,20,21,22,23,24,
 26,27,28,29,30,32,33,35,37,38,39,41,42,43,44,47,
 48,50,51,52,53,56,57,58,59,60,62,63,65,66,67,68,
 69,71,72,73,74,75,77,78,80,82,83,84,86,87,88,89]