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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.

A292143 Triangle read by rows: T(n,k) = (-4)^(1 - k mod 2) * T(n-k,k-1) + T(n-k,k) with T(0,0) = 1 for 0 <= k <= A003056(n).

Table of values

n a(n)
0 1
1 0
2 1
3 0
4 1
5 0
6 1
7 -4
8 0
9 1
10 -4
11 0
12 1
13 -8
14 0
15 1
16 -8
17 -4
18 0
19 1
20 -12
21 -4
22 0
23 1
24 -12
25 -8
26 0
27 1
28 -16
29 -12
30 0
31 1
32 -16
33 -16
34 16
35 0
36 1
37 -20
38 -20
39 16
40 0
41 1
42 -20
43 -28
44 32
45 0
46 1
47 -24
48 -32
49 48
50 0
51 1
52 -24
53 -40
54 80
55 0
56 1
57 -28
58 -48
59 96
60 16
61 0
62 1
63 -28
64 -56
65 144
66 16
67 0
68 1
69 -32

List of values

[1, 0, 1, 0, 1, 0, 1, -4, 0, 1, -4, 0, 1, -8, 0, 1, -8, -4, 0, 1, -12, -4, 0, 1, -12, -8, 0, 1, -16, -12, 0, 1, -16, -16, 16, 0, 1, -20, -20, 16, 0, 1, -20, -28, 32, 0, 1, -24, -32, 48, 0, 1, -24, -40, 80, 0, 1, -28, -48, 96, 16, 0, 1, -28, -56, 144, 16, 0, 1, -32]

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