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A247833 as a simple table

na(n)
01
11
21
33
44
55
66
77
88
910
1011
1112
1213
1314
1415
1517
1618
1719
1820
1921
2022
2123
2225
2326
2427
2528
2629
2730
2832
2933
3034
3135
3236
3337
3439
3540
3641
3742
3843
3944
4046
4147
4248
4349
4450
4551
4653
4754
4855
4956
5057
5158
5259
5361
5462
5563
5664
5765
5866
5968
6069
6170
6271
6372
6473
6575
6676

[1,1,1,3,4,5,6,7,8,10,11,12,13,14,15,17,18,19,20,
 21,22,23,25,26,27,28,29,30,32,33,34,35,36,37,39,
 40,41,42,43,44,46,47,48,49,50,51,53,54,55,56,57,
 58,59,61,62,63,64,65,66,68,69,70,71,72,73,75,76]