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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.

A181974 Triangle T(n,k), read by rows, given by (1, 1, -1, 0, 0, 0, 0, 0, 0, 0, ...) DELTA (1, 0, -3, 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 1
2 1
3 2
4 3
5 1
6 3
7 4
8 2
9 1
10 5
11 7
12 5
13 4
14 1
15 8
16 11
17 10
18 9
19 3
20 1
21 13
22 18
23 20
24 20
25 9
26 5
27 1
28 21
29 29
30 38
31 40
32 22
33 15
34 4
35 1
36 34
37 47
38 71
39 78
40 51
41 40
42 14
43 6
44 1
45 55
46 76
47 130
48 147
49 111
50 95
51 40
52 22
53 5
54 1
55 89
56 123
57 235
58 272
59 233
60 213
61 105
62 68
63 20
64 7
65 1

List of values

[1, 1, 1, 2, 3, 1, 3, 4, 2, 1, 5, 7, 5, 4, 1, 8, 11, 10, 9, 3, 1, 13, 18, 20, 20, 9, 5, 1, 21, 29, 38, 40, 22, 15, 4, 1, 34, 47, 71, 78, 51, 40, 14, 6, 1, 55, 76, 130, 147, 111, 95, 40, 22, 5, 1, 89, 123, 235, 272, 233, 213, 105, 68, 20, 7, 1]

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