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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.

A216210 Square array T read by antidiagonals: T(n,k) = 0 if n-k>=4 or if k-n>=4, T(3,0) = T(2,0) = TT(1,0) = T(0,0) = T(0,1) = T(0,2) = T(0,3) = 1, T(n,k) = T(n-1,k) + T(n,k-1).

Table of values

n a(n)
0 1
1 1
2 1
3 1
4 2
5 1
6 1
7 3
8 3
9 1
10 0
11 4
12 6
13 4
14 0
15 0
16 4
17 10
18 10
19 4
20 0
21 0
22 0
23 14
24 20
25 14
26 0
27 0
28 0
29 0
30 14
31 34
32 34
33 14
34 0
35 0
36 0
37 0
38 0
39 48
40 68
41 48
42 0
43 0
44 0
45 0
46 0
47 0
48 48
49 116
50 116
51 48
52 0
53 0
54 0
55 0
56 0
57 0
58 0
59 164
60 232
61 164
62 0
63 0
64 0
65 0

List of values

[1, 1, 1, 1, 2, 1, 1, 3, 3, 1, 0, 4, 6, 4, 0, 0, 4, 10, 10, 4, 0, 0, 0, 14, 20, 14, 0, 0, 0, 0, 14, 34, 34, 14, 0, 0, 0, 0, 0, 48, 68, 48, 0, 0, 0, 0, 0, 0, 48, 116, 116, 48, 0, 0, 0, 0, 0, 0, 0, 164, 232, 164, 0, 0, 0, 0]

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