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A047255 as a simple table

na(n)
11
22
33
45
57
68
79
811
913
1014
1115
1217
1319
1420
1521
1623
1725
1826
1927
2029
2131
2232
2333
2435
2537
2638
2739
2841
2943
3044
3145
3247
3349
3450
3551
3653
3755
3856
3957
4059
4161
4262
4363
4465
4567
4668
4769
4871
4973
5074
5175
5277
5379
5480
5581
5683
5785
5886
5987
6089
6191
6292
6393
6495
6597
6698
6799
68101
69103
70104

[1,2,3,5,7,8,9,11,13,14,15,17,19,20,21,23,25,26,
 27,29,31,32,33,35,37,38,39,41,43,44,45,47,49,50,
 51,53,55,56,57,59,61,62,63,65,67,68,69,71,73,74,
 75,77,79,80,81,83,85,86,87,89,91,92,93,95,97,98,
 99,101,103,104]