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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.

A000703 Chromatic number (or Heawood number) of nonorientable surface with n crosscaps.

Table of values

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

List of values

[4, 6, 7, 7, 8, 9, 9, 10, 10, 10, 11, 11, 12, 12, 12, 13, 13, 13, 13, 14, 14, 14, 15, 15, 15, 15, 16, 16, 16, 16, 16, 17, 17, 17, 17, 18, 18, 18, 18, 18, 19, 19, 19, 19, 19, 19, 20, 20, 20, 20, 20, 21, 21, 21, 21, 21, 21, 22, 22, 22, 22, 22, 22, 22, 23, 23, 23, 23, 23, 23, 24, 24, 24, 24]

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

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