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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.

A155041 Diagonal sums of symmetric (1,-1)-triangle A155040.

Table of values

n a(n)
0 1
1 1
2 2
3 0
4 1
5 -1
6 2
7 0
8 3
9 -1
10 2
11 -2
12 3
13 -1
14 4
15 -2
16 3
17 -3
18 4
19 -2
20 5
21 -3
22 4
23 -4
24 5
25 -3
26 6
27 -4
28 5
29 -5
30 6
31 -4
32 7
33 -5
34 6
35 -6
36 7
37 -5
38 8
39 -6
40 7
41 -7
42 8
43 -6
44 9
45 -7
46 8
47 -8
48 9
49 -7
50 10
51 -8
52 9
53 -9
54 10
55 -8
56 11
57 -9
58 10
59 -10
60 11
61 -9
62 12
63 -10
64 11
65 -11
66 12
67 -10
68 13
69 -11
70 12
71 -12
72 13
73 -11
74 14
75 -12
76 13

List of values

[1, 1, 2, 0, 1, -1, 2, 0, 3, -1, 2, -2, 3, -1, 4, -2, 3, -3, 4, -2, 5, -3, 4, -4, 5, -3, 6, -4, 5, -5, 6, -4, 7, -5, 6, -6, 7, -5, 8, -6, 7, -7, 8, -6, 9, -7, 8, -8, 9, -7, 10, -8, 9, -9, 10, -8, 11, -9, 10, -10, 11, -9, 12, -10, 11, -11, 12, -10, 13, -11, 12, -12, 13, -11, 14, -12, 13]

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