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A156707 as a simple table

na(n)
1-1
21
3-1
40
5-1
61
70
81
9-1
100
11-1
120
130
141
15-1
160
170
181
190
201
21-1
220
23-1
240
250
261
270
280
29-1
301
310
320
33-1
340
35-1
361
370
380
39-1
400
41-1
420
430
441
450
460
470
481
490
501
51-1
520
53-1
541
550
561
570
580
590
600
610
620
63-1
640
65-1
660
670
681
69-1
700
710
720
730
741
75-1
760
770
781
790
800
81-1
820
83-1
840
850
861
870
880
89-1
901
910
920
930
940
95-1

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