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.

A211990 Triangle read by rows: T(n,k) = total number of regions in the last k shells of n.

Table of values

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

List of values

[1, 1, 2, 1, 2, 3, 2, 3, 4, 5, 2, 4, 5, 6, 7, 4, 6, 8, 9, 10, 11, 4, 8, 10, 12, 13, 14, 15, 7, 11, 15, 17, 19, 20, 21, 22, 8, 15, 19, 23, 25, 27, 28, 29, 30, 12, 20, 27, 31, 35, 37, 39, 40, 41, 42, 14, 26, 34, 41, 45, 49, 51, 53, 54, 55, 56, 21, 35, 47]

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

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