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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.

A202064 Triangle T(n,k), read by rows, given by (2, -1/2, 1/2, 0, 0, 0, 0, 0, 0, 0, ...) DELTA (0, 1/2, -1/2, 0, 0, 0, 0, 0, 0, 0, ...) where DELTA is the operator defined in A084938.

Table of values

n a(n)
0 1
1 2
2 0
3 3
4 1
5 0
6 4
7 4
8 0
9 0
10 5
11 10
12 1
13 0
14 0
15 6
16 20
17 6
18 0
19 0
20 0
21 7
22 35
23 21
24 1
25 0
26 0
27 0
28 8
29 56
30 56
31 8
32 0
33 0
34 0
35 0
36 9
37 84
38 126
39 36
40 1
41 0
42 0
43 0
44 0
45 10
46 120
47 252
48 120
49 10
50 0
51 0
52 0
53 0
54 0
55 11
56 165
57 462
58 330
59 55
60 1
61 0
62 0
63 0
64 0
65 0

List of values

[1, 2, 0, 3, 1, 0, 4, 4, 0, 0, 5, 10, 1, 0, 0, 6, 20, 6, 0, 0, 0, 7, 35, 21, 1, 0, 0, 0, 8, 56, 56, 8, 0, 0, 0, 0, 9, 84, 126, 36, 1, 0, 0, 0, 0, 10, 120, 252, 120, 10, 0, 0, 0, 0, 0, 11, 165, 462, 330, 55, 1, 0, 0, 0, 0, 0]

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