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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.

A199011 Triangle T(n,k), read by rows, given by (1,1,-1,1,0,0,0,0,0,0,0,...) DELTA (0,1,0,0,0,0,0,0,0,0,0,0,...) where DELTA is the operator defined in A084938.

Table of values

n a(n)
0 1
1 1
2 0
3 2
4 1
5 0
6 3
7 3
8 1
9 0
10 4
11 6
12 4
13 1
14 0
15 5
16 10
17 10
18 5
19 1
20 0
21 6
22 15
23 20
24 15
25 6
26 1
27 0
28 7
29 21
30 35
31 35
32 21
33 7
34 1
35 0
36 8
37 28
38 56
39 70
40 56
41 28
42 8
43 1
44 0
45 9
46 36
47 84
48 126
49 126
50 84
51 36
52 9
53 1
54 0
55 10
56 45
57 120
58 210
59 252
60 210
61 120
62 45
63 10
64 1
65 0

List of values

[1, 1, 0, 2, 1, 0, 3, 3, 1, 0, 4, 6, 4, 1, 0, 5, 10, 10, 5, 1, 0, 6, 15, 20, 15, 6, 1, 0, 7, 21, 35, 35, 21, 7, 1, 0, 8, 28, 56, 70, 56, 28, 8, 1, 0, 9, 36, 84, 126, 126, 84, 36, 9, 1, 0, 10, 45, 120, 210, 252, 210, 120, 45, 10, 1, 0]

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