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This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.

A281010 Triangle read by rows in which row 2n-1 lists the widths of the symmetric representation of sigma(n), and row 2n lists a finite sequence S together with -1, with the property that the partial sums of S give the row 2n-1.

Table of values

n a(n)
1 1
2 1
3 -1
4 1
5 1
6 1
7 1
8 0
9 0
10 -1
11 1
12 1
13 0
14 1
15 1
16 1
17 0
18 -1
19 1
20 0
21 -1
22 1
23 1
24 1
25 1
26 1
27 1
28 1
29 1
30 0
31 0
32 0
33 0
34 0
35 0
36 -1
37 1
38 1
39 1
40 0
41 0
42 0
43 1
44 1
45 1
46 1
47 0
48 0
49 -1
50 0
51 0
52 1
53 0
54 0
55 -1
56 1
57 1
58 1
59 1
60 1
61 2
62 1
63 1
64 1
65 1
66 1
67 1
68 0
69 0
70 0
71 0
72 1
73 -1
74 0
75 0
76 0
77 0
78 -1
79 1
80 1
81 1
82 1
83 0
84 0
85 0
86 0
87 0
88 1
89 1
90 1
91 1
92 1
93 0
94 0
95 0
96 -1
97 0
98 0
99 0
100 0
101 1
102 0
103 0
104 0
105 -1
106 1
107 1
108 1
109 1
110 1
111 1
112 1
113 1
114 1
115 1
116 1
117 1
118 1
119 1
120 1
121 1
122 0
123 0
124 0
125 0
126 0
127 0
128 0
129 0
130 0
131 0
132 0
133 0
134 0
135 0
136 -1

List of values

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