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”).

A206831 as a simple table

na(n)
01
11
21
3-1
40
51
6-1
7-3
8-1
91
101
110
12-4
13-2
141
151
165
174
18-4
19-3
201
21-1
220
239
2410
25-3
26-4
271
28-1
29-7
30-9
319
3217
33-1
34-5
351
361
370
38-16
39-28
402
4124
422
43-6
441
451
469
4716
48-16
49-54
50-14
5130
526
53-7
541
55-1
560
5725
5860
5910

[1,1,1,-1,0,1,-1,-3,-1,1,1,0,-4,-2,1,1,5,4,-4,-3,
 1,-1,0,9,10,-3,-4,1,-1,-7,-9,9,17,-1,-5,1,1,0,-16,
 -28,2,24,2,-6,1,1,9,16,-16,-54,-14,30,6,-7,1,-1,0,
 25,60,10]