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A087508 as a simple table

na(n)
00
11
21
30
42
52
60
73
83
90
104
114
120
135
145
150
166
176
180
197
207
210
228
238
240
259
269
270
2810
2910
300
3111
3211
330
3412
3512
360
3713
3813
390
4014
4114
420
4315
4415
450
4616
4716
480
4917
5017
510
5218
5318
540
5519
5619
570
5820
5920
600
6121
6221
630
6422
6522
660
6723
6823
690
7024
7124
720
7325
7425
750
7626
7726
780
7927
8027
810
8228
8328
840

[0,1,1,0,2,2,0,3,3,0,4,4,0,5,5,0,6,6,0,7,7,0,8,8,
 0,9,9,0,10,10,0,11,11,0,12,12,0,13,13,0,14,14,0,
 15,15,0,16,16,0,17,17,0,18,18,0,19,19,0,20,20,0,
 21,21,0,22,22,0,23,23,0,24,24,0,25,25,0,26,26,0,
 27,27,0,28,28,0]