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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.

A056943 Unused area of rectangle needed to enclose a non-touching spiral of length n on a square lattice.

Table of values

n a(n)
0 0
1 0
2 0
3 1
4 2
5 1
6 3
7 5
8 4
9 3
10 6
11 9
12 8
13 7
14 6
15 10
16 14
17 13
18 12
19 11
20 10
21 15
22 20
23 19
24 18
25 17
26 16
27 15
28 21
29 27
30 26
31 25
32 24
33 23
34 22
35 21
36 28
37 35
38 34
39 33
40 32
41 31
42 30
43 29
44 28
45 36
46 44
47 43
48 42
49 41
50 40
51 39
52 38
53 37
54 36
55 45
56 54
57 53
58 52
59 51
60 50
61 49
62 48
63 47
64 46
65 45
66 55
67 65
68 64
69 63
70 62
71 61
72 60
73 59

List of values

[0, 0, 0, 1, 2, 1, 3, 5, 4, 3, 6, 9, 8, 7, 6, 10, 14, 13, 12, 11, 10, 15, 20, 19, 18, 17, 16, 15, 21, 27, 26, 25, 24, 23, 22, 21, 28, 35, 34, 33, 32, 31, 30, 29, 28, 36, 44, 43, 42, 41, 40, 39, 38, 37, 36, 45, 54, 53, 52, 51, 50, 49, 48, 47, 46, 45, 55, 65, 64, 63, 62, 61, 60, 59]

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

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