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.

A123663 Number of shared edges in a spiral of n unit squares.

Table of values

n a(n)
1 0
2 1
3 2
4 4
5 5
6 7
7 8
8 10
9 12
10 13
11 15
12 17
13 18
14 20
15 22
16 24
17 25
18 27
19 29
20 31
21 32
22 34
23 36
24 38
25 40
26 41
27 43
28 45
29 47
30 49
31 50
32 52
33 54
34 56
35 58
36 60
37 61
38 63
39 65
40 67
41 69
42 71
43 72
44 74
45 76
46 78
47 80
48 82
49 84
50 85
51 87
52 89
53 91
54 93
55 95
56 97
57 98
58 100
59 102
60 104
61 106
62 108
63 110
64 112
65 113
66 115
67 117
68 119

List of values

[0, 1, 2, 4, 5, 7, 8, 10, 12, 13, 15, 17, 18, 20, 22, 24, 25, 27, 29, 31, 32, 34, 36, 38, 40, 41, 43, 45, 47, 49, 50, 52, 54, 56, 58, 60, 61, 63, 65, 67, 69, 71, 72, 74, 76, 78, 80, 82, 84, 85, 87, 89, 91, 93, 95, 97, 98, 100, 102, 104, 106, 108, 110, 112, 113, 115, 117, 119]

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

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