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A064800 as a simple table

na(n)
11
23
34
46
56
68
78
811
911
1012
1112
1215
1314
1416
1517
1620
1718
1821
1920
2023
2123
2224
2324
2428
2527
2628
2730
2831
2930
3033
3132
3237
3335
3436
3537
3640
3738
3840
3941
4044
4142
4245
4344
4447
4548
4648
4748
4853
4951
5053
5153
5255
5354
5458
5557
5660
5759
5860
5960
6064
6162
6264
6366
6470
6567
6669
6768
6871
6971
7073
7172

[1,3,4,6,6,8,8,11,11,12,12,15,14,16,17,20,18,21,
 20,23,23,24,24,28,27,28,30,31,30,33,32,37,35,36,
 37,40,38,40,41,44,42,45,44,47,48,48,48,53,51,53,
 53,55,54,58,57,60,59,60,60,64,62,64,66,70,67,69,
 68,71,71,73,72]