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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.

A228053 A triangle formed like Pascal's triangle, but with (-1)^(n+1) on the borders instead of 1.

Table of values

n a(n)
0 -1
1 1
2 1
3 -1
4 2
5 -1
6 1
7 1
8 1
9 1
10 -1
11 2
12 2
13 2
14 -1
15 1
16 1
17 4
18 4
19 1
20 1
21 -1
22 2
23 5
24 8
25 5
26 2
27 -1
28 1
29 1
30 7
31 13
32 13
33 7
34 1
35 1
36 -1
37 2
38 8
39 20
40 26
41 20
42 8
43 2
44 -1
45 1
46 1
47 10
48 28
49 46
50 46
51 28
52 10
53 1
54 1
55 -1
56 2
57 11
58 38
59 74
60 92
61 74
62 38
63 11
64 2
65 -1
66 1
67 1
68 13
69 49
70 112
71 166
72 166
73 112

List of values

[-1, 1, 1, -1, 2, -1, 1, 1, 1, 1, -1, 2, 2, 2, -1, 1, 1, 4, 4, 1, 1, -1, 2, 5, 8, 5, 2, -1, 1, 1, 7, 13, 13, 7, 1, 1, -1, 2, 8, 20, 26, 20, 8, 2, -1, 1, 1, 10, 28, 46, 46, 28, 10, 1, 1, -1, 2, 11, 38, 74, 92, 74, 38, 11, 2, -1, 1, 1, 13, 49, 112, 166, 166, 112]

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