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A071981 as a simple table

na(n)
10
21
31
40
50
60
71
80
90
100
110
121
131
140
150
161
170
181
191
201
210
220
230
240
251
260
271
281
291
301
310
320
330
340
350
361
371
381
391
401
410
420
431
440
451
461
470
481
491
501
511
521
531
541
550
561
570
580
591
600
611
620
630
641
651
660
670
680
691
700
710
721
730
741
751
761
771
780
791
801
811
820
831
841
851
861
870
880
891
901
910
921
930
941
951
960
970
980
990
1001
1010
1020
1031
1040
1050

[0,1,1,0,0,0,1,0,0,0,0,1,1,0,0,1,0,1,1,1,0,0,0,0,
 1,0,1,1,1,1,0,0,0,0,0,1,1,1,1,1,0,0,1,0,1,1,0,1,1,
 1,1,1,1,1,0,1,0,0,1,0,1,0,0,1,1,0,0,0,1,0,0,1,0,1,
 1,1,1,0,1,1,1,0,1,1,1,1,0,0,1,1,0,1,0,1,1,0,0,0,0,
 1,0,0,1,0,0]