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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.

A279009 Alternating Jacobsthal triangle A_{-2}(n,k) read by rows.

Table of values

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

List of values

[1, 1, 1, -2, 0, 1, -2, -2, -1, 1, 4, 0, -1, -2, 1, 4, 4, 1, 1, -3, 1, -8, 0, 3, 0, 4, -4, 1, -8, -8, -3, 3, -4, 8, -5, 1, 16, 0, -5, -6, 7, -12, 13, -6, 1, 16, 16, 5, 1, -13, 19, -25, 19, -7, 1, -32, 0, 11, 4, 14, -32, 44, -44, 26, -8, 1]