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A215020 as a simple table

na(n)
10
20
31
40
50
61
72
80
90
101
110
120
131
142
153
160
170
181
190
200
211
222
230
240
251
260
270
281
292
303
314
320
330
341
350
360
371
382
390
400
411
420
430
441
452
463
470
480
491
500
510
521
532
540
550
561
570
580
591
602
613
624
635
640
650
661
670
680
691
702
710
720
731
740
750
761
772
783
790
800
811
820
830
841
852
860
870
881
890
900
911
922
933
944
950
960
971
980
990
1001
1012
1020
1030
1041
1050
1060
1071
1082
1093
1100
1110
1121
1130
1140
1151
1162
1170
1180
1191

[0,0,1,0,0,1,2,0,0,1,0,0,1,2,3,0,0,1,0,0,1,2,0,0,
 1,0,0,1,2,3,4,0,0,1,0,0,1,2,0,0,1,0,0,1,2,3,0,0,1,
 0,0,1,2,0,0,1,0,0,1,2,3,4,5,0,0,1,0,0,1,2,0,0,1,0,
 0,1,2,3,0,0,1,0,0,1,2,0,0,1,0,0,1,2,3,4,0,0,1,0,0,
 1,2,0,0,1,0,0,1,2,3,0,0,1,0,0,1,2,0,0,1]