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A281552 as a simple table

na(n)
10
21
31
42
52
66
72
83
93
109
113
128
138
149
153
164
174
1812
194
2011
2111
2212
234
2410
2510
2618
2710
2811
2911
3012
314
325
335
3415
355
3614
3714
3815
395
4013
4113
4223
4313
4414
4514
4615
475
4812
4912
5022
5112
5221
5321
5422
5512
5613
5713
5823
5913
6014
6114
6215
635
646
656
6618
676
6817
6917
7018
716
7216
7316
7428
7516
7617
7717
7818
796

[0,1,1,2,2,6,2,3,3,9,3,8,8,9,3,4,4,12,4,11,11,12,
 4,10,10,18,10,11,11,12,4,5,5,15,5,14,14,15,5,13,
 13,23,13,14,14,15,5,12,12,22,12,21,21,22,12,13,13,
 23,13,14,14,15,5,6,6,18,6,17,17,18,6,16,16,28,16,
 17,17,18,6]