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A176890 as a simple table

na(n)
1-1
21
30
41
50
60
71
81
90
100
111
120
130
140
150
161
171
181
190
200
210
221
230
240
250
260
270
280
291
301
310
321
330
340
350
360
371
380
391
400
410
420
430
440
450
461
471
480
490
501
510
520
530
540
550
561
570
580
590
600
610
620
630
640
650
660
671
681
691
701
710
721
730
740
750
760
770
780
791
800
810
820
830
840
850
860
870
880
890
900
910
921
931
940
950
960
970
981
990
1000
1010
1020
1030
1040
1050

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