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A056980 as a simple table

na(n)
10
20
30
40
50
61
70
80
90
100
110
121
131
141
150
160
170
180
190
200
210
221
230
241
251
261
271
281
291
301
310
320
330
340
350
360
370
381
390
400
410
420
430
441
451
461
470
481
491
501
511
521
531
542
551
561
571
581
591
601
611
621
630
640
650
660
670
680
690
701
710
720
730
740
750
761
771
781
790
800
810
820
830
840
850
861
870
881
891
901
911
921
931
941
950
961
971
981
991
1001
1011
1022

[0,0,0,0,0,1,0,0,0,0,0,1,1,1,0,0,0,0,0,0,0,1,0,1,
 1,1,1,1,1,1,0,0,0,0,0,0,0,1,0,0,0,0,0,1,1,1,0,1,1,
 1,1,1,1,2,1,1,1,1,1,1,1,1,0,0,0,0,0,0,0,1,0,0,0,0,
 0,1,1,1,0,0,0,0,0,0,0,1,0,1,1,1,1,1,1,1,0,1,1,1,1,
 1,1,2]