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.

A245556 Irregular triangle read by rows: T(n,k) (n>=0, 0 <= k <= 2n) = number of triples (u,v,w) with entries in the range 0 to n which have some pair adding up to k.

Table of values

n a(n)
0 1
1 4
2 6
3 4
4 7
5 12
6 19
7 12
8 7
9 10
10 18
11 28
12 36
13 28
14 18
15 10
16 13
17 24
18 37
19 48
20 61
21 48
22 37
23 24
24 13
25 16
26 30
27 46
28 60
29 76
30 90
31 76
32 60
33 46
34 30
35 16
36 19
37 36
38 55
39 72
40 91
41 108
42 127
43 108
44 91
45 72
46 55
47 36
48 19
49 22
50 42
51 64
52 84
53 106
54 126
55 148
56 168
57 148
58 126
59 106
60 84
61 64
62 42
63 22

List of values

[1, 4, 6, 4, 7, 12, 19, 12, 7, 10, 18, 28, 36, 28, 18, 10, 13, 24, 37, 48, 61, 48, 37, 24, 13, 16, 30, 46, 60, 76, 90, 76, 60, 46, 30, 16, 19, 36, 55, 72, 91, 108, 127, 108, 91, 72, 55, 36, 19, 22, 42, 64, 84, 106, 126, 148, 168, 148, 126, 106, 84, 64, 42, 22]