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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.

A216238 Square array T, read by antidiagonals: T(n,k) = 0 if n-k>=1 or if k-n>=5, T(0,0) = T(0,1) = T(0,2) = T(0,3) = T(0,4) = 1, T(n,k) = T(n-1,k) + T(n,k-1).

Table of values

n a(n)
0 1
1 1
2 0
3 1
4 1
5 0
6 1
7 2
8 0
9 0
10 1
11 3
12 2
13 0
14 0
15 0
16 4
17 5
18 0
19 0
20 0
21 0
22 4
23 9
24 5
25 0
26 0
27 0
28 0
29 0
30 13
31 14
32 0
33 0
34 0
35 0
36 0
37 0
38 13
39 27
40 14
41 0
42 0
43 0
44 0
45 0
46 0
47 0
48 40
49 41
50 0
51 0
52 0
53 0
54 0
55 0
56 0
57 0
58 40
59 81
60 41
61 0
62 0
63 0
64 0
65 0
66 0
67 0
68 0
69 0
70 121
71 122
72 0
73 0
74 0
75 0
76 0
77 0

List of values

[1, 1, 0, 1, 1, 0, 1, 2, 0, 0, 1, 3, 2, 0, 0, 0, 4, 5, 0, 0, 0, 0, 4, 9, 5, 0, 0, 0, 0, 0, 13, 14, 0, 0, 0, 0, 0, 0, 13, 27, 14, 0, 0, 0, 0, 0, 0, 0, 40, 41, 0, 0, 0, 0, 0, 0, 0, 0, 40, 81, 41, 0, 0, 0, 0, 0, 0, 0, 0, 0, 121, 122, 0, 0, 0, 0, 0, 0]

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