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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.

A287688 Triangle read by rows: T(j,k) is the number of distinct edge segment pairs in a j X k rectangular grid.

Table of values

n a(n)
1 2
2 6
3 7
4 10
5 15
6 13
7 15
8 21
9 28
10 22
11 21
12 28
13 36
14 45
15 32
16 28
17 36
18 45
19 55
20 66
21 45
22 36
23 45
24 55
25 66
26 78
27 91
28 59
29 45
30 55
31 66
32 78
33 91
34 105
35 120
36 76
37 55
38 66
39 78
40 91
41 105
42 120
43 136
44 153
45 94
46 66
47 78
48 91
49 105
50 120
51 136
52 153
53 171
54 190
55 115
56 78
57 91
58 105
59 120
60 136
61 153
62 171
63 190
64 210
65 231
66 137

List of values

[2, 6, 7, 10, 15, 13, 15, 21, 28, 22, 21, 28, 36, 45, 32, 28, 36, 45, 55, 66, 45, 36, 45, 55, 66, 78, 91, 59, 45, 55, 66, 78, 91, 105, 120, 76, 55, 66, 78, 91, 105, 120, 136, 153, 94, 66, 78, 91, 105, 120, 136, 153, 171, 190, 115, 78, 91, 105, 120, 136, 153, 171, 190, 210, 231, 137]

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

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