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.

A257564 Irregular triangle read by rows: T(n,k) = r(n+k)+r(n-k) with r(n) = (n-(n mod 2))/2 for n>=0 and -n<=k<=n.

Table of values

n a(n)
0 0
1 1
2 0
3 1
4 2
5 1
6 2
7 1
8 2
9 3
10 2
11 3
12 2
13 3
14 2
15 3
16 4
17 3
18 4
19 3
20 4
21 3
22 4
23 3
24 4
25 5
26 4
27 5
28 4
29 5
30 4
31 5
32 4
33 5
34 4
35 5
36 6
37 5
38 6
39 5
40 6
41 5
42 6
43 5
44 6
45 5
46 6
47 5
48 6
49 7
50 6
51 7
52 6
53 7
54 6
55 7
56 6
57 7
58 6
59 7
60 6
61 7
62 6
63 7
64 8
65 7
66 8
67 7
68 8
69 7
70 8
71 7
72 8
73 7
74 8
75 7
76 8
77 7
78 8
79 7
80 8

List of values

[0, 1, 0, 1, 2, 1, 2, 1, 2, 3, 2, 3, 2, 3, 2, 3, 4, 3, 4, 3, 4, 3, 4, 3, 4, 5, 4, 5, 4, 5, 4, 5, 4, 5, 4, 5, 6, 5, 6, 5, 6, 5, 6, 5, 6, 5, 6, 5, 6, 7, 6, 7, 6, 7, 6, 7, 6, 7, 6, 7, 6, 7, 6, 7, 8, 7, 8, 7, 8, 7, 8, 7, 8, 7, 8, 7, 8, 7, 8, 7, 8]

Started in 1964 by Neil J. A. Sloane | Maintained by The OEIS Foundation Inc.

Content is available under The OEIS End-User License Agreement.