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A037840 as a simple table

na(n)
10
20
30
40
50
60
70
81
90
101
112
123
134
145
156
162
171
180
191
202
213
224
235
243
252
261
270
281
292
303
314
324
333
342
351
360
371
382
393
405
414
423
432
441
450
461
472
486
495
504
513
522
531
540
551
567
576
585
594
603
612
621
630
641
652
663
674
685
696
707
718
721
730
741
752
763
774
785
796
803
812
821
832
843
854
865
876
885
894
903

[0,0,0,0,0,0,0,1,0,1,2,3,4,5,6,2,1,0,1,2,3,4,5,3,
 2,1,0,1,2,3,4,4,3,2,1,0,1,2,3,5,4,3,2,1,0,1,2,6,5,
 4,3,2,1,0,1,7,6,5,4,3,2,1,0,1,2,3,4,5,6,7,8,1,0,1,
 2,3,4,5,6,3,2,1,2,3,4,5,6,5,4,3]