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A280237 as a simple table

na(n)
00
11
20
31
4-1
51
60
71
80
91
100
111
12-1
131
140
151
160
171
180
191
20-1
211
220
231
240
251
260
271
28-1
291
300
311
320
331
340
351
36-1
371
380
391
400
411
420
431
44-1
451
460
471
480
491
500
511
52-1
531
540
551
560
571
580
591
60-1
611
620
631
640
651
660
671
68-1
691
700
711
720
731
740
751
76-1
771
780
791
800
811
820
831

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