login

Year-end appeal: Please make a donation to the OEIS Foundation to support ongoing development and maintenance of the OEIS. We are now in our 61st year, we have over 378,000 sequences, and we’ve reached 11,000 citations (which often say “discovered thanks to the OEIS”).

A131851 as a simple table

na(n)
00
11
20
31
4-1
50
6-1
70
80
91
100
111
12-1
130
14-1
150
161
172
181
192
200
211
220
231
241
252
261
272
280
291
300
311
320
331
340
351
36-1
370
38-1
390
400
411
420
431
44-1
450
46-1
470
481
492
501
512
520
531
540
551
561
572
581
592
600
611
620
631
64-1
650
66-1
670
68-2
69-1
70-2
71-1
72-1
730
74-1
750
76-2
77-1
78-2
79-1
800
811
820
831
84-1
850
86-1
870
880
891
900
911
92-1
930
94-1
950
96-1
970
98-1
990
100-2
101-1
102-2
103-1
104-1
1050
106-1
1070
108-2
109-1
110-2

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