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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.

A291957 Triangle read by rows: T(n,k) = T(n-k,k-1) - T(n-k,k) + T(n-k,k+1) 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 1
8 0
9 0
10 -1
11 0
12 -1
13 0
14 0
15 1
16 1
17 1
18 0
19 0
20 -1
21 -1
22 0
23 -1
24 1
25 0
26 0
27 2
28 0
29 0
30 0
31 -2
32 -2
33 0
34 1
35 0
36 0
37 2
38 1
39 -1
40 0
41 2
42 0
43 0
44 0
45 0
46 -2
47 -1
48 -1
49 0
50 0
51 1
52 2
53 0
54 -1
55 0
56 1
57 -2
58 0
59 2
60 1
61 0
62 -3
63 -1
64 0
65 0
66 -1
67 0
68 2
69 3
70 1
71 -1
72 0
73 0
74 1
75 -2
76 0
77 1
78 0
79 0
80 -3
81 0

List of values

[1, 0, 1, 0, -1, 0, 1, 1, 0, 0, -1, 0, -1, 0, 0, 1, 1, 1, 0, 0, -1, -1, 0, -1, 1, 0, 0, 2, 0, 0, 0, -2, -2, 0, 1, 0, 0, 2, 1, -1, 0, 2, 0, 0, 0, 0, -2, -1, -1, 0, 0, 1, 2, 0, -1, 0, 1, -2, 0, 2, 1, 0, -3, -1, 0, 0, -1, 0, 2, 3, 1, -1, 0, 0, 1, -2, 0, 1, 0, 0, -3, 0]

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