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A065864 as a simple table

na(n)
10
20
30
40
51
60
71
80
94
104
115
125
136
146
156
166
177
187
198
208
218
228
239
249
259
269
279
289
2910
3010
3111
3211
3311
3411
3511
3611
3712
3812
3912
4012
4113
4213
4314
4414
4514
4614
4715
4815
4915
5015
5115
5215
5316
5416
5516
5616
5716
5816
5917
6017
6118
6218
6318
6418
6518
6618
6719
6819
6919
7019
7120
7220
7321
7421
7521
7621
7721
7821

[0,0,0,0,1,0,1,0,4,4,5,5,6,6,6,6,7,7,8,8,8,8,9,9,
 9,9,9,9,10,10,11,11,11,11,11,11,12,12,12,12,13,13,
 14,14,14,14,15,15,15,15,15,15,16,16,16,16,16,16,
 17,17,18,18,18,18,18,18,19,19,19,19,20,20,21,21,
 21,21,21,21]