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A026840 as a simple table

na(n)
11
20
31
40
51
62
70
80
91
102
110
120
131
142
153
160
170
181
192
203
214
220
230
240
252
263
274
285
290
300
310
321
333
344
355
366
370
380
390
401
413
425
436
447
458
460
470
480
491
503
515
527
538
549
5510
560
570
580
590
602
615
627
639
6410
6511
6612
670
680
690
700
712
725
738
7410
7512
7613
7714
7815
790
800
810
820
831
844
858
8611

[1,0,1,0,1,2,0,0,1,2,0,0,1,2,3,0,0,1,2,3,4,0,0,0,
 2,3,4,5,0,0,0,1,3,4,5,6,0,0,0,1,3,5,6,7,8,0,0,0,1,
 3,5,7,8,9,10,0,0,0,0,2,5,7,9,10,11,12,0,0,0,0,2,5,
 8,10,12,13,14,15,0,0,0,0,1,4,8,11]