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A072748 as a simple table

na(n)
10
20
31
41
52
62
72
82
92
102
113
123
133
144
154
164
174
184
195
205
216
226
236
246
256
267
277
288
298
308
318
329
339
349
3510
3610
3710
3810
3910
4010
4111
4211
4312
4412
4512
4612
4712
4812
4913
5013
5113
5213
5313
5413
5514
5614
5714
5815
5915
6015
6115
6215
6316
6416
6517
6617
6717
6817
6917
7018
7118
7219
7319
7419
7519
7619
7720
7820
7921
8021

[0,0,1,1,2,2,2,2,2,2,3,3,3,4,4,4,4,4,5,5,6,6,6,6,
 6,7,7,8,8,8,8,9,9,9,10,10,10,10,10,10,11,11,12,12,
 12,12,12,12,13,13,13,13,13,13,14,14,14,15,15,15,
 15,15,16,16,17,17,17,17,17,18,18,19,19,19,19,19,
 20,20,21,21]