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A223542 as a simple table

na(n)
00
11
21
33
42
53
65
75
85
95
109
117
124
137
149
1511
1611
176
186
1911
2011
2115
2213
2315
248
2515
2613
2715
2819
2919
3019
3119
3219
3319
3419
3519
3627
3723
3817
3923
4010
4123
4217
4323
4427
4529
4629
4721
4821
4912
5012
5121
5221
5329
5429
5533
5631
5733
5825
5916
6014
6116
6225
6333
6431

[0,1,1,3,2,3,5,5,5,5,9,7,4,7,9,11,11,6,6,11,11,15,
 13,15,8,15,13,15,19,19,19,19,19,19,19,19,27,23,17,
 23,10,23,17,23,27,29,29,21,21,12,12,21,21,29,29,
 33,31,33,25,16,14,16,25,33,31]