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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.

A199881 Triangle T(n,k), read by rows, given by (1,-1,0,0,0,0,0,0,0,0,0,...) DELTA (1,0,-1,1,0,0,0,0,0,0,0,...) where DELTA is the operator defined in A084938.

Table of values

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

List of values

[1, 1, 1, 0, 1, 1, 0, 1, 2, 1, 0, 0, 2, 3, 1, 0, 0, 1, 4, 4, 1, 0, 0, 0, 3, 7, 5, 1, 0, 0, 0, 1, 7, 11, 6, 1, 0, 0, 0, 0, 4, 14, 16, 7, 1, 0, 0, 0, 0, 1, 11, 25, 22, 8, 1, 0, 0, 0, 0, 0, 5, 25, 41, 29, 9, 1, 0, 0, 0, 0, 0, 1, 16, 50, 63, 37, 10, 1]

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