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A241816 as a simple table

na(n)
00
11
21
33
42
53
65
77
84
95
109
117
1210
1311
1413
1515
168
179
1817
1911
2018
2119
2221
2315
2420
2521
2625
2723
2826
2927
3029
3131
3216
3317
3433
3519
3634
3735
3837
3923
4036
4137
4241
4339
4442
4543
4645
4731
4840
4941
5049
5143
5250
5351
5453
5547
5652
5753
5857
5955
6058
6159
6261
6363
6432
6533
6665
6735
6866
6967
7069

[0,1,1,3,2,3,5,7,4,5,9,7,10,11,13,15,8,9,17,11,18,
 19,21,15,20,21,25,23,26,27,29,31,16,17,33,19,34,
 35,37,23,36,37,41,39,42,43,45,31,40,41,49,43,50,
 51,53,47,52,53,57,55,58,59,61,63,32,33,65,35,66,
 67,69]