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.

A333288 Triangle read by rows: consider a figure made up of a row of n congruent rectangles and the diagonals of all visible rectangles; T(n,k) (1 <= k <= n) is the number of regions in the k-th rectangle.

Table of values

n a(n)
1 4
2 8
3 8
4 12
5 22
6 12
7 16
8 36
9 36
10 16
11 20
12 52
13 70
14 52
15 20
16 24
17 66
18 100
19 100
20 66
21 24
22 28
23 82
24 134
25 160
26 134
27 82
28 28
29 32
30 98
31 166
32 218
33 218
34 166
35 98
36 32
37 36
38 116
39 198
40 276
41 310
42 276
43 198
44 116
45 36
46 40
47 134
48 230
49 328
50 396
51 396
52 328
53 230
54 134
55 40
56 44
57 154
58 266
59 386

List of values

[4, 8, 8, 12, 22, 12, 16, 36, 36, 16, 20, 52, 70, 52, 20, 24, 66, 100, 100, 66, 24, 28, 82, 134, 160, 134, 82, 28, 32, 98, 166, 218, 218, 166, 98, 32, 36, 116, 198, 276, 310, 276, 198, 116, 36, 40, 134, 230, 328, 396, 396, 328, 230, 134, 40, 44, 154, 266, 386]

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

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