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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.

A292142 Triangle read by rows: T(n,k) = (-4)^(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 -4
3 0
4 -4
5 0
6 -4
7 -4
8 0
9 -4
10 -4
11 0
12 -4
13 -8
14 0
15 -4
16 -8
17 16
18 0
19 -4
20 -12
21 16
22 0
23 -4
24 -12
25 32
26 0
27 -4
28 -16
29 48
30 0
31 -4
32 -16
33 64
34 16
35 0
36 -4
37 -20
38 80
39 16
40 0
41 -4
42 -20
43 112
44 32
45 0
46 -4
47 -24
48 128
49 48
50 0
51 -4
52 -24
53 160
54 80
55 0
56 -4
57 -28
58 192
59 96
60 -64
61 0
62 -4
63 -28
64 224
65 144

List of values

[1, 0, -4, 0, -4, 0, -4, -4, 0, -4, -4, 0, -4, -8, 0, -4, -8, 16, 0, -4, -12, 16, 0, -4, -12, 32, 0, -4, -16, 48, 0, -4, -16, 64, 16, 0, -4, -20, 80, 16, 0, -4, -20, 112, 32, 0, -4, -24, 128, 48, 0, -4, -24, 160, 80, 0, -4, -28, 192, 96, -64, 0, -4, -28, 224, 144]

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