cp's OEIS Frontend

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.

A365968 Irregular triangle read by rows: T(n,k) (0 <= n, 0 <= k < 2^n). An infinite binary tree with root node 0 in row n = 0. Each node then has left child (2*j) - k - 1 and right child (2*j) - k + 1, where j and k are the values of the parent and grandparent nodes respectively.

Table of values

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

List of values

[0, -1, 1, -3, -1, 1, 3, -6, -4, -2, 0, 0, 2, 4, 6, -10, -8, -6, -4, -4, -2, 0, 2, -2, 0, 2, 4, 4, 6, 8, 10, -15, -13, -11, -9, -9, -7, -5, -3, -7, -5, -3, -1, -1, 1, 3, 5, -5, -3, -1, 1, 1, 3, 5, 7, 3, 5, 7, 9, 9, 11, 13, 15, -21, -19, -17, -15, -15, -13, -11, -9]