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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.

A183584 T(n,k)=Half the number of nXk 0..3 arrays with each element equal to either the maximum or the minimum of its horizontal and vertical neighbors.

Table of values

n a(n)
1 0
2 2
3 2
4 2
5 14
6 2
7 8
8 78
9 78
10 8
11 14
12 407
13 814
14 407
15 14
16 38
17 2216
18 9667
19 9667
20 2216
21 38
22 80
23 12024
24 110674
25 240358
26 110674
27 12024
28 80
29 194
30 65277
31 1282814
32 5987795
33 5987795
34 1282814
35 65277
36 194
37 434
38 354615
39 14823037
40 149355515
41 320224986
42 149355515

List of values

[0, 2, 2, 2, 14, 2, 8, 78, 78, 8, 14, 407, 814, 407, 14, 38, 2216, 9667, 9667, 2216, 38, 80, 12024, 110674, 240358, 110674, 12024, 80, 194, 65277, 1282814, 5987795, 5987795, 1282814, 65277, 194, 434, 354615, 14823037, 149355515, 320224986, 149355515]

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

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